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Lei M, Willis MA, Schmidt BE, Li C. Numerical Investigation of Odor-Guided Navigation in Flying Insects: Impact of Turbulence, Wingbeat-Induced Flow, and Schmidt Number on Odor Plume Structures. Biomimetics (Basel) 2023; 8:593. [PMID: 38132532 PMCID: PMC10741642 DOI: 10.3390/biomimetics8080593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 11/04/2023] [Accepted: 11/30/2023] [Indexed: 12/23/2023] Open
Abstract
Odor-guided navigation is fundamental to the survival and reproductive success of many flying insects. Despite its biological importance, the mechanics of how insects sense and interpret odor plumes in the presence of complex flow fields remain poorly understood. This study employs numerical simulations to investigate the influence of turbulence, wingbeat-induced flow, and Schmidt number on the structure and perception of odor plumes by flying insects. Using an in-house computational fluid dynamics solver based on the immersed-boundary method, we solve the three-dimensional Navier-Stokes equations to model the flow field. The solver is coupled with the equations of motion for passive flapping wings to emulate wingbeat-induced flow. The odor landscape is then determined by solving the odor advection-diffusion equation. By employing a synthetic isotropic turbulence generator, we introduce turbulence into the flow field to examine its impact on odor plume structures. Our findings reveal that both turbulence and wingbeat-induced flow substantially affect odor plume characteristics. Turbulence introduces fluctuations and perturbations in the plume, while wingbeat-induced flow draws the odorant closer to the insect's antennae. Moreover, we demonstrate that the Schmidt number, which affects odorant diffusivity, plays a significant role in odor detectability. Specifically, at high Schmidt numbers, larger fluctuations in odor sensitivity are observed, which may be exploited by insects to differentiate between various odorant volatiles emanating from the same source. This study provides new insights into the complex interplay between fluid dynamics and sensory biology and behavior, enhancing our understanding of how flying insects successfully navigate using olfactory cues in turbulent environments.
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Affiliation(s)
- Menglong Lei
- Department of Mechanical Engineering, Villanova University, Villanova, PA 19085, USA;
| | - Mark A. Willis
- Department of Biology, Case Western Reserve University, Cleveland, OH 44106, USA;
| | - Bryan E. Schmidt
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, USA;
| | - Chengyu Li
- Department of Mechanical Engineering, Villanova University, Villanova, PA 19085, USA;
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2
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Chahine GL, Schmidt BE, Deng X, Hsiao CT, Liu Q. Bubble dynamics in a pressure gradient with reentrant jet break through and energy loss. Ultrason Sonochem 2023; 99:106541. [PMID: 37531835 PMCID: PMC10415789 DOI: 10.1016/j.ultsonch.2023.106541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 07/13/2023] [Accepted: 07/28/2023] [Indexed: 08/04/2023]
Abstract
The dynamics of a bubble in a pressure gradient is investigated experimentally and numerically with particular emphasis on the behavior at reentrant jet impact and break through the opposite side of the bubble with corresponding energy loss and vorticity generation. High speed photography observations of a bubble generated by electric spark energy deposit in a low ambient pressure tank are coupled with wavelet based Optical Flow Velocimetry (wOFV) and Boundary Element Method (BEM) numerical analysis to examine the flow field resulting from the reentrant jet formation and break through. We study, as an illustration, the effects of the constant pressure gradient due to gravity on the bubble dynamics. Energy losses between the first and second cycle are measured for the bubbles generated under various conditions characterized by a non-dimensional pressure gradient parameter, and the corresponding measured energy loss is used in the numerical simulations. Good correspondence is seen between the image analysis, the wOFV computations, and the BEM results and insight is gained on the involved physics.
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Affiliation(s)
- G L Chahine
- Dynaflow, Inc., 10621 Iron Bridge Road, Jessup, MD, USA.
| | - B E Schmidt
- Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH, USA
| | - X Deng
- Dynaflow, Inc., 10621 Iron Bridge Road, Jessup, MD, USA
| | - C-T Hsiao
- Dynaflow, Inc., 10621 Iron Bridge Road, Jessup, MD, USA
| | - Q Liu
- Dynaflow, Inc., 10621 Iron Bridge Road, Jessup, MD, USA
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3
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Howard NS, Alrefaie A, Mejia NA, Ugbeye T, Schmidt BE. Characterizing Aerosol Generating Procedures With Background Oriented Schlieren. J Biomech Eng 2023; 145:074502. [PMID: 36961437 PMCID: PMC10158973 DOI: 10.1115/1.4062191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 03/20/2023] [Accepted: 03/20/2023] [Indexed: 03/25/2023]
Abstract
The potential for characterizing aerosol generating procedures (AGPs) using background oriented schlieren (BOS) flow visualization was investigated in two clinical situations. A human-scale BOS system was used on a manikin simulating jet ventilation and extubation. A novel approach to representation of the BOS images using line integral convolution allows direct evaluation of both magnitude and direction of the refractive index gradient field. Plumes issuing from the manikin's mouth were clearly visualized and characterized in both experiments, and it is recommended that BOS be adapted into a clinical tool for risk evaluation in clinical environments.
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Affiliation(s)
- N. Scott Howard
- School of Medicine, Case Western Reserve University Otolaryngology, Head and Neck Surgery, University Hospitals Cleveland Medical Center, Cleveland, OH 44106
| | - Abdulaziz Alrefaie
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University Cleveland, Cleveland, OH 44106
| | - Nicholas A. Mejia
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University Cleveland, Cleveland, OH 44106
| | - Tosan Ugbeye
- S.C.O.P.E. Medical Cleveland, Cleveland, OH 44106
| | - Bryan E. Schmidt
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University Cleveland, Cleveland, OH 44106
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4
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Schmidt BE, Washam P, Davis PED, Nicholls KW, Holland DM, Lawrence JD, Riverman KL, Smith JA, Spears A, Dichek DJG, Mullen AD, Clyne E, Yeager B, Anker P, Meister MR, Hurwitz BC, Quartini ES, Bryson FE, Basinski-Ferris A, Thomas C, Wake J, Vaughan DG, Anandakrishnan S, Rignot E, Paden J, Makinson K. Publisher Correction: Heterogeneous melting near the Thwaites Glacier grounding line. Nature 2023; 615:E21. [PMID: 36829047 PMCID: PMC10017506 DOI: 10.1038/s41586-023-05861-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Affiliation(s)
- B E Schmidt
- Department of Astronomy, Cornell University, Ithaca, NY, USA. .,Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA.
| | - P Washam
- Department of Astronomy, Cornell University, Ithaca, NY, USA.,Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA
| | | | | | - D M Holland
- Courant Institute of Mathematical Sciences, New York University, New York, NY, USA.,Center for Global Sea Level Change, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
| | - J D Lawrence
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - K L Riverman
- Department of Environmental Studies, University of Portland, Portland, OR, USA
| | - J A Smith
- British Antarctic Survey, Cambridge, UK
| | - A Spears
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - D J G Dichek
- Department of Astronomy, Cornell University, Ithaca, NY, USA.,Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA
| | - A D Mullen
- Department of Astronomy, Cornell University, Ithaca, NY, USA.,Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA
| | - E Clyne
- Department of Geosciences, Pennsylvania State University, State College, PA, USA.,Environmental Studies, Lewis & Clark College, Portland, OR, USA
| | - B Yeager
- Center for Global Sea Level Change, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
| | - P Anker
- British Antarctic Survey, Cambridge, UK
| | - M R Meister
- Department of Astronomy, Cornell University, Ithaca, NY, USA.,Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA
| | - B C Hurwitz
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - E S Quartini
- Department of Astronomy, Cornell University, Ithaca, NY, USA.,Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA
| | - F E Bryson
- Department of Astronomy, Cornell University, Ithaca, NY, USA.,Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA.,School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - A Basinski-Ferris
- Courant Institute of Mathematical Sciences, New York University, New York, NY, USA
| | - C Thomas
- British Antarctic Survey, Cambridge, UK
| | - J Wake
- British Antarctic Survey, Cambridge, UK
| | | | - S Anandakrishnan
- Department of Geosciences, Pennsylvania State University, State College, PA, USA
| | - E Rignot
- Department of Earth System Science, University of California, Irvine, Irvine, CA, USA
| | - J Paden
- Center for Remote Sensing and Integrated Systems, University of Kansas, Lawrence, KS, USA
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Schmidt BE, Washam P, Davis PED, Nicholls KW, Holland DM, Lawrence JD, Riverman KL, Smith JA, Spears A, Dichek DJG, Mullen AD, Clyne E, Yeager B, Anker P, Meister MR, Hurwitz BC, Quartini ES, Bryson FE, Basinski-Ferris A, Thomas C, Wake J, Vaughan DG, Anandakrishnan S, Rignot E, Paden J, Makinson K. Heterogeneous melting near the Thwaites Glacier grounding line. Nature 2023; 614:471-478. [PMID: 36792738 PMCID: PMC9931587 DOI: 10.1038/s41586-022-05691-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 12/22/2022] [Indexed: 02/17/2023]
Abstract
Thwaites Glacier represents 15% of the ice discharge from the West Antarctic Ice Sheet and influences a wider catchment1-3. Because it is grounded below sea level4,5, Thwaites Glacier is thought to be susceptible to runaway retreat triggered at the grounding line (GL) at which the glacier reaches the ocean6,7. Recent ice-flow acceleration2,8 and retreat of the ice front8-10 and GL11,12 indicate that ice loss will continue. The relative impacts of mechanisms underlying recent retreat are however uncertain. Here we show sustained GL retreat from at least 2011 to 2020 and resolve mechanisms of ice-shelf melt at the submetre scale. Our conclusions are based on observations of the Thwaites Eastern Ice Shelf (TEIS) from an underwater vehicle, extending from the GL to 3 km oceanward and from the ice-ocean interface to the sea floor. These observations show a rough ice base above a sea floor sloping upward towards the GL and an ocean cavity in which the warmest water exceeds 2 °C above freezing. Data closest to the ice base show that enhanced melting occurs along sloped surfaces that initiate near the GL and evolve into steep-sided terraces. This pronounced melting along steep ice faces, including in crevasses, produces stratification that suppresses melt along flat interfaces. These data imply that slope-dependent melting sculpts the ice base and acts as an important response to ocean warming.
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Affiliation(s)
- B E Schmidt
- Department of Astronomy, Cornell University, Ithaca, NY, USA.
- Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA.
| | - P Washam
- Department of Astronomy, Cornell University, Ithaca, NY, USA
- Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA
| | | | | | - D M Holland
- Courant Institute of Mathematical Sciences, New York University, New York, NY, USA
- Center for Global Sea Level Change, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
| | - J D Lawrence
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - K L Riverman
- Department of Environmental Studies, University of Portland, Portland, OR, USA
| | - J A Smith
- British Antarctic Survey, Cambridge, UK
| | - A Spears
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - D J G Dichek
- Department of Astronomy, Cornell University, Ithaca, NY, USA
- Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA
| | - A D Mullen
- Department of Astronomy, Cornell University, Ithaca, NY, USA
- Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA
| | - E Clyne
- Department of Geosciences, Pennsylvania State University, State College, PA, USA
- Environmental Studies, Lewis & Clark College, Portland, OR, USA
| | - B Yeager
- Center for Global Sea Level Change, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
| | - P Anker
- British Antarctic Survey, Cambridge, UK
| | - M R Meister
- Department of Astronomy, Cornell University, Ithaca, NY, USA
- Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA
| | - B C Hurwitz
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - E S Quartini
- Department of Astronomy, Cornell University, Ithaca, NY, USA
- Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA
| | - F E Bryson
- Department of Astronomy, Cornell University, Ithaca, NY, USA
- Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - A Basinski-Ferris
- Courant Institute of Mathematical Sciences, New York University, New York, NY, USA
| | - C Thomas
- British Antarctic Survey, Cambridge, UK
| | - J Wake
- British Antarctic Survey, Cambridge, UK
| | | | - S Anandakrishnan
- Department of Geosciences, Pennsylvania State University, State College, PA, USA
| | - E Rignot
- Department of Earth System Science, University of California, Irvine, Irvine, CA, USA
| | - J Paden
- Center for Remote Sensing and Integrated Systems, University of Kansas, Lawrence, KS, USA
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Kucukal E, Man Y, Gurkan UA, Schmidt BE. Blood Flow Velocimetry in a Microchannel During Coagulation Using Particle Image Velocimetry and Wavelet-Based Optical Flow Velocimetry. J Biomech Eng 2021; 143:1105252. [PMID: 33764427 DOI: 10.1115/1.4050647] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Indexed: 01/05/2023]
Abstract
This article describes novel measurements of the velocity of whole blood flow in a microchannel during coagulation. The blood is imaged volumetrically using a simple optical setup involving a white light source and a microscope camera. The images are processed using particle image velocimetry (PIV) and wavelet-based optical flow velocimetry (wOFV), both of which use images of individual blood cells as flow tracers. Measurements of several clinically relevant parameters such as the clotting time, decay rate, and blockage ratio are computed. The high-resolution wOFV results yield highly detailed information regarding thrombus formation and corresponding flow evolution that is the first of its kind.
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Affiliation(s)
- E Kucukal
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106
| | - Y Man
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106
| | - Umut A Gurkan
- Warren E. Rupp Associate Professor Department of Mechanical and Aerospace Engineering, Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, OH 44106; Department of Biomedical Engineering, Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, OH 44106
| | - B E Schmidt
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106
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Fan G, Carpeggiani PA, Tao Z, Coccia G, Safaei R, Kaksis E, Pugzlys A, Légaré F, Schmidt BE, Baltuška A. 70 mJ nonlinear compression and scaling route for an Yb amplifier using large-core hollow fibers. Opt Lett 2021; 46:896-899. [PMID: 33577542 DOI: 10.1364/ol.412296] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 12/14/2020] [Indexed: 06/12/2023]
Abstract
In this Letter, we investigate the energy-scaling rules of hollow-core fiber (HCF)-based nonlinear pulse propagation and compression merged with high-energy Yb-laser technology, in a regime where the effects such as plasma disturbance, optical damages, and setup size become important limiting parameters. As a demonstration, 70 mJ 230 fs pulses from a high-energy Yb laser amplifier were compressed down to 40 mJ 25 fs by using a 2.8-m-long stretched HCF with a core diameter of 1 mm, resulting in a record peak power of 1.3 TW. This work presents a critical advance of a high-energy pulse (hundreds of mJ level) nonlinear interactions platform based on high energy sub-ps Yb technology with considerable applications, including driving intense THz, X-ray pulses, Wakefield acceleration, parametric wave mixing and ultraviolet generation, and tunable long-wavelength generation via enhanced Raman scattering.
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Scully JEC, Schenk PM, Castillo-Rogez JC, Buczkowski DL, Williams DA, Pasckert JH, Duarte KD, Romero VN, Quick LC, Sori MM, Landis ME, Raymond CA, Neesemann A, Schmidt BE, Sizemore HG, Russell CT. The varied sources of faculae-forming brines in Ceres' Occator crater emplaced via hydrothermal brine effusion. Nat Commun 2020; 11:3680. [PMID: 32778642 PMCID: PMC7417532 DOI: 10.1038/s41467-020-15973-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 04/06/2020] [Indexed: 11/23/2022] Open
Abstract
Before acquiring highest-resolution data of Ceres, questions remained about the emplacement mechanism and source of Occator crater's bright faculae. Here we report that brine effusion emplaced the faculae in a brine-limited, impact-induced hydrothermal system. Impact-derived fracturing enabled brines to reach the surface. The central faculae, Cerealia and Pasola Facula, postdate the central pit, and were primarily sourced from an impact-induced melt chamber, with some contribution from a deeper, pre-existing brine reservoir. Vinalia Faculae, in the crater floor, were sourced from the laterally extensive deep reservoir only. Vinalia Faculae are comparatively thinner and display greater ballistic emplacement than the central faculae because the deep reservoir brines took a longer path to the surface and contained more gas than the shallower impact-induced melt chamber brines. Impact-derived fractures providing conduits, and mixing of impact-induced melt with deeper endogenic brines, could also allow oceanic material to reach the surfaces of other large icy bodies.
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Affiliation(s)
- J E C Scully
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
| | - P M Schenk
- Lunar and Planetary Institute, Houston, TX, USA
| | - J C Castillo-Rogez
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - D L Buczkowski
- Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA
| | - D A Williams
- School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA
| | - J H Pasckert
- Institute für Planetologie, University of Münster, Münster, Germany
| | - K D Duarte
- Georgia Institute of Technology, Atlanta, GA, USA
| | - V N Romero
- Georgia Institute of Technology, Atlanta, GA, USA
| | - L C Quick
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - M M Sori
- Lunar and Planetary Laboratory, Tucson, AZ, USA
| | - M E Landis
- Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, USA
| | - C A Raymond
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - A Neesemann
- Free University of Berlin, 14195, Berlin, Germany
| | - B E Schmidt
- Georgia Institute of Technology, Atlanta, GA, USA
| | | | - C T Russell
- University of California, Los Angeles, CA, USA
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9
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Fan G, Safaei R, Kwon O, Schuster V, Légaré K, Lassonde P, Ehteshami A, Arias L, Laramée A, Beaudoin-Bertrand J, Limpert J, Tao Z, Spanner M, Schmidt BE, Ibrahim H, Baltuška A, Légaré F. High energy redshifted and enhanced spectral broadening by molecular alignment. Opt Lett 2020; 45:3013-3016. [PMID: 32479446 DOI: 10.1364/ol.387037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Accepted: 04/20/2020] [Indexed: 06/11/2023]
Abstract
We demonstrate an efficient approach for enhancing the spectral broadening of long laser pulses and for efficient frequency redshifting by exploiting the intrinsic temporal properties of molecular alignment inside a gas-filled hollow-core fiber (HCF). We find that laser-induced alignment with durations comparable to the characteristic rotational time scale TRotAlign enhances the efficiency of redshifted spectral broadening compared to noble gases. The applicability of this approach to Yb lasers with (few hundred femtoseconds) long pulse duration is illustrated, for which efficient broadening based on conventional Kerr nonlinearity is challenging to achieve. Furthermore, this approach proposes a practical solution for high energy broadband long-wavelength light sources, and it is attractive for many strong field applications.
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Leblanc A, Dalla-Barba G, Lassonde P, Laramée A, Schmidt BE, Cormier E, Ibrahim H, Légaré F. High-field mid-infrared pulses derived from frequency domain optical parametric amplification. Opt Lett 2020; 45:2267-2270. [PMID: 32287210 DOI: 10.1364/ol.389804] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 03/20/2020] [Indexed: 06/11/2023]
Abstract
We present a novel, to the best of our knowledge, approach for scaling the peak power of mid-infrared laser pulses with few-cycle duration and carrier-to-envelope phase stabilization. Using frequency domain optical parametric amplification (FOPA), selective amplification is performed on two spectral slices of broadband pulses centered at 1.8 µm wavelength. In addition to amplification, the Fourier plane is used for specific pulse shaping to control both the relative polarization and the phase/delay between the two spectral slices of the input pulses. At the output of the FOPA, intrapulse difference frequency generation provides carrier-envelope phase stabilized two-cycle pulses centered at 9.5 µm wavelength with 25.5 µJ pulse energy. The control of the carrier-envelope phase is demonstrated through the dependence of high-harmonic generation in solids. This architecture is perfectly adapted to be scaled in the future to high average and high peak powers using picosecond ytterbium laser technologies.
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Leblanc A, Lassonde P, Petit S, Delagnes JC, Haddad E, Ernotte G, Bionta MR, Gruson V, Schmidt BE, Ibrahim H, Cormier E, Légaré F. Phase-matching-free pulse retrieval based on transient absorption in solids. Opt Express 2019; 27:28998-29015. [PMID: 31684642 DOI: 10.1364/oe.27.028998] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 08/11/2019] [Indexed: 06/10/2023]
Abstract
In this paper, we introduce a pulse characterization technique that is free of phase-matching constraints, exploiting transient absorption in solids as an ultrafast optical switch. Based on a pump-probe setup, this technique uses pump pulses of sufficient intensity to induce the switch, while the pulses to characterize are probing the transmissivity drop of the photoexcited material. This enables the characterization of low-intensity ultra-broadband pulses at the detection limit of the spectrometer and within the transparency range of the solid. For example, by using zinc selenide (ZnSe), pulses with wavelengths from 0.5 to 20 μm can be characterized, denoting five octaves of spectral range. Using ptychography, we retrieve the temporal profiles of both the probe pulse and the switch. To demonstrate this approach, we measure ultrashort pulses from a titanium-sapphire (Ti-Sa) amplifier, which are compressed using a hollow core fiber setup, as well as infrared to mid-infrared pulses generated from an optical parametric amplifier (OPA). The characterized pulses are centered at wavelengths of 0.77, 1.53, 1.75, 4, and 10 μm, down to sub-two optical cycles duration, exceeding an octave of bandwidth, and with energy as low as a few nanojoules.
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Fareed MA, Strelkov VV, Singh M, Thiré N, Mondal S, Schmidt BE, Légaré F, Ozaki T. Harmonic Generation from Neutral Manganese Atoms in the Vicinity of the Giant Autoionization Resonance. Phys Rev Lett 2018; 121:023201. [PMID: 30085730 DOI: 10.1103/physrevlett.121.023201] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Indexed: 06/08/2023]
Abstract
High harmonics from laser-ablated plumes are mostly generated from ionic species. We demonstrate that with ultrashort infrared (∼1.82 μm) driving lasers, high harmonics from laser-ablated manganese are predominantly generated from neutral atoms, a transition metal atom with an ionization potential of 7.4 eV. Our results open the possibility to advance laser-ablation technique to study the dynamics of neutral atoms of low ionization potential. Moreover, as manganese contains giant autoionizing resonance, intense and broadband high harmonics have been demonstrated from this resonance at energies from 49 to 53 eV. This opens the possibility to generate intense attosecond pulses directly from the giant resonances, as well as to study these resonances using high-harmonic spectroscopy.
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Affiliation(s)
- M A Fareed
- Institut National de la Recherche Scientifique-Centre Energie Matériaux Telécommunications, 1650 Lionel-Boulet, Varennes, Québec J3X 1S2, Canada
| | - V V Strelkov
- A. M. Prokhorov General Physics Institute of RAS, Vavilova Street 38, 119991 Moscow, Russia
- Moscow Institute of Physics and Technology (State University), 141700 Dolgoprudny, Moscow Region, Russia
| | - M Singh
- Institut National de la Recherche Scientifique-Centre Energie Matériaux Telécommunications, 1650 Lionel-Boulet, Varennes, Québec J3X 1S2, Canada
| | - N Thiré
- Institut National de la Recherche Scientifique-Centre Energie Matériaux Telécommunications, 1650 Lionel-Boulet, Varennes, Québec J3X 1S2, Canada
| | - S Mondal
- Institut National de la Recherche Scientifique-Centre Energie Matériaux Telécommunications, 1650 Lionel-Boulet, Varennes, Québec J3X 1S2, Canada
- ELI-ALPS, ELI-Hu Kft., Dugonics ter 13, H-6720 Szeged, Hungary
| | - B E Schmidt
- Institut National de la Recherche Scientifique-Centre Energie Matériaux Telécommunications, 1650 Lionel-Boulet, Varennes, Québec J3X 1S2, Canada
- few-cycle, Inc., 2890 Rue de Beaurivage, Montreal, Quebec H1L 5W5, Canada
| | - F Légaré
- Institut National de la Recherche Scientifique-Centre Energie Matériaux Telécommunications, 1650 Lionel-Boulet, Varennes, Québec J3X 1S2, Canada
| | - T Ozaki
- Institut National de la Recherche Scientifique-Centre Energie Matériaux Telécommunications, 1650 Lionel-Boulet, Varennes, Québec J3X 1S2, Canada
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Gruson V, Ernotte G, Lassonde P, Laramée A, Bionta MR, Chaker M, Di Mauro L, Corkum PB, Ibrahim H, Schmidt BE, Legaré F. 2.5 TW, two-cycle IR laser pulses via frequency domain optical parametric amplification. Opt Express 2017; 25:27706-27714. [PMID: 29092241 DOI: 10.1364/oe.25.027706] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Accepted: 10/06/2017] [Indexed: 06/07/2023]
Abstract
Broadband optical parametric amplification in the IR region has reached a new milestone through the use of a non-collinear Frequency domain Optical Parametric Amplification system. We report a laser source delivering 11.6 fs pulses with 30 mJ of energy at a central wavelength of 1.8 μm at 10 Hz repetition rate corresponding to a peak power of 2.5 TW. The peak power scaling is accompanied by a pulse shortening of about 20% upon amplification due to the spectral reshaping with higher gain in the spectral wings. This source paves the way for high flux soft X-ray pulses and IR-driven laser wakefield acceleration.
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14
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Fareed MA, Strelkov VV, Thiré N, Mondal S, Schmidt BE, Légaré F, Ozaki T. High-order harmonic generation from the dressed autoionizing states. Nat Commun 2017; 8:16061. [PMID: 28714468 PMCID: PMC5520015 DOI: 10.1038/ncomms16061] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 05/25/2017] [Indexed: 11/13/2022] Open
Abstract
In high-order harmonic generation, resonant harmonics (RH) are sources of intense, coherent extreme-ultraviolet radiation. However, intensity enhancement of RH only occurs for a single harmonic order, making it challenging to generate short attosecond pulses. Moreover, the mechanism involved behind such RH was circumstantial, because of the lack of direct experimental proofs. Here, we demonstrate the exact quantum paths that electron follows for RH generation using tin, showing that it involves not only the autoionizing state, but also a harmonic generation from dressed-AIS that appears as two coherent satellite harmonics at frequencies ±2Ω from the RH (Ω represents laser frequency). Our observations of harmonic emission from dressed states open the possibilities of generating intense and broadband attosecond pulses, thus contributing to future applications in attosecond science, as well as the perspective of studying the femtosecond and attosecond dynamics of autoionizing states. High-energy photons in XUV range and attosecond pulses are generated from infrared laser pulses through high harmonic generation in gases and solids. Here, the authors demonstrate the microscopic origin of resonant harmonic generation involving the autoionizing states of Sn in plasma plumes.
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Affiliation(s)
- M A Fareed
- Institut national de la recherche scientifique-Centre Energie Matériaux Telécommunications, 1650 Lionel-Boulet, Varennes, Québec, Canada J3X 1S2
| | - V V Strelkov
- A. M. Prokhorov General Physics Institute of RAS, Vavilova street 38, 119991 Moscow, Russia.,Moscow Institute of Physics and Technology (State University), 141700 Dolgoprudny, Moscow Region, Russia
| | - N Thiré
- Institut national de la recherche scientifique-Centre Energie Matériaux Telécommunications, 1650 Lionel-Boulet, Varennes, Québec, Canada J3X 1S2
| | - S Mondal
- Institut national de la recherche scientifique-Centre Energie Matériaux Telécommunications, 1650 Lionel-Boulet, Varennes, Québec, Canada J3X 1S2.,ELI-ALPS, ELI-Hu Kft., Dugonics ter 13, H-6720 Szeged, Hungary
| | - B E Schmidt
- Institut national de la recherche scientifique-Centre Energie Matériaux Telécommunications, 1650 Lionel-Boulet, Varennes, Québec, Canada J3X 1S2.,few-cycle, Inc., 2890 Rue de Beaurivage, Montreal, Quebec, Canada H1L 5W5
| | - F Légaré
- Institut national de la recherche scientifique-Centre Energie Matériaux Telécommunications, 1650 Lionel-Boulet, Varennes, Québec, Canada J3X 1S2
| | - T Ozaki
- Institut national de la recherche scientifique-Centre Energie Matériaux Telécommunications, 1650 Lionel-Boulet, Varennes, Québec, Canada J3X 1S2
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15
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Ernotte G, Lassonde P, Légaré F, Schmidt BE. Frequency domain tailoring for intra-pulse frequency mixing. Opt Express 2016; 24:24225-24231. [PMID: 27828252 DOI: 10.1364/oe.24.024225] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Generating mid infrared (MIR) pulses by difference frequency generation (DFG) is often a trade-off between the maximum stability given by all-inline intra-pulse arrangements and the independent control of pulse parameters with inter-pulse pump-probe like scenarios. We propose a coalescence between both opposing approaches by realizing an all-inline inter-pulse DFG scheme employing a 4-f setup. This allows independent manipulation of the amplitude, delay and polarization of the two corresponding spectral side bands of a supercontinuum source while maintaining 20 attoseconds jitter without any feedback stabilization. After filamentation in air, the broadened Ti:Sa spectrum is tailored in a 4-f setup to generate tunable MIR pulses. In this manner, 2 µm, 4.8 µJ, 26.5 fs and carrier-envelope-phase (CEP) stabilized pulses are generated in a single DFG stage.
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16
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Buczkowski DL, Schmidt BE, Williams DA, Mest SC, Scully JEC, Ermakov AI, Preusker F, Schenk P, Otto KA, Hiesinger H, O'Brien D, Marchi S, Sizemore H, Hughson K, Chilton H, Bland M, Byrne S, Schorghofer N, Platz T, Jaumann R, Roatsch T, Sykes MV, Nathues A, De Sanctis MC, Raymond CA, Russell CT. The geomorphology of Ceres. Science 2016; 353:353/6303/aaf4332. [PMID: 27701088 DOI: 10.1126/science.aaf4332] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Accepted: 07/22/2016] [Indexed: 11/02/2022]
Abstract
Analysis of Dawn spacecraft Framing Camera image data allows evaluation of the topography and geomorphology of features on the surface of Ceres. The dwarf planet is dominated by numerous craters, but other features are also common. Linear structures include both those associated with impact craters and those that do not appear to have any correlation to an impact event. Abundant lobate flows are identified, and numerous domical features are found at a range of scales. Features suggestive of near-surface ice, cryomagmatism, and cryovolcanism have been identified. Although spectroscopic analysis has currently detected surface water ice at only one location on Ceres, the identification of these potentially ice-related features suggests that there may be at least some ice in localized regions in the crust.
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Affiliation(s)
- D L Buczkowski
- Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA.
| | - B E Schmidt
- Georgia Institute of Technology, Atlanta, GA 30332, USA
| | | | - S C Mest
- Planetary Science Institute, Tucson, AZ 85719, USA
| | - J E C Scully
- NASA Jet Propulsion Laboratory, La Cañada Flintridge, CA 91011, USA
| | - A I Ermakov
- Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - F Preusker
- German Aerospace Center (DLR), Berlin 12489, Germany
| | - P Schenk
- Lunar and Planetary Institute, Houston, TX 77058, USA
| | - K A Otto
- German Aerospace Center (DLR), Berlin 12489, Germany
| | - H Hiesinger
- Westfälische Wilhelms-Universität Münster, Münster 48149, Germany
| | - D O'Brien
- Planetary Science Institute, Tucson, AZ 85719, USA
| | - S Marchi
- Southwest Research Institute, Boulder, CO 80302, USA
| | - H Sizemore
- Planetary Science Institute, Tucson, AZ 85719, USA
| | - K Hughson
- University of California, Los Angeles, CA 90095, USA
| | - H Chilton
- Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - M Bland
- United States Geological Survey, Flagstaff, AZ 86001, USA
| | - S Byrne
- Lunar and Planetary Laboratory, Tucson, AZ 85721, USA
| | - N Schorghofer
- University of Hawaii at Manoa, Honolulu, HI 96822, USA
| | - T Platz
- Max Planck Institute for Solar System Research, Göttingen 37077, Germany
| | - R Jaumann
- German Aerospace Center (DLR), Berlin 12489, Germany
| | - T Roatsch
- German Aerospace Center (DLR), Berlin 12489, Germany
| | - M V Sykes
- Planetary Science Institute, Tucson, AZ 85719, USA
| | - A Nathues
- Max Planck Institute for Solar System Research, Göttingen 37077, Germany
| | - M C De Sanctis
- Istituto di Astrofisica e Planetologia Spaziale INAF, Rome 00133, Italy
| | - C A Raymond
- NASA Jet Propulsion Laboratory, La Cañada Flintridge, CA 91011, USA
| | - C T Russell
- University of California, Los Angeles, CA 90095, USA
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Vampa G, Hammond TJ, Thiré N, Schmidt BE, Légaré F, McDonald CR, Brabec T, Klug DD, Corkum PB. All-Optical Reconstruction of Crystal Band Structure. Phys Rev Lett 2015; 115:193603. [PMID: 26588381 DOI: 10.1103/physrevlett.115.193603] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Indexed: 06/05/2023]
Abstract
The band structure of matter determines its properties. In solids, it is typically mapped with angle-resolved photoemission spectroscopy, in which the momentum and the energy of incoherent electrons are independently measured. Sometimes, however, photoelectrons are difficult or impossible to detect. Here we demonstrate an all-optical technique to reconstruct momentum-dependent band gaps by exploiting the coherent motion of electron-hole pairs driven by intense midinfrared femtosecond laser pulses. Applying the method to experimental data for a semiconductor ZnO crystal, we identify the split-off valence band as making the greatest contribution to tunneling to the conduction band. Our new band structure measurement technique is intrinsically bulk sensitive, does not require a vacuum, and has high temporal resolution, making it suitable to study reactions at ambient conditions, matter under extreme pressures, and ultrafast transient modifications to band structures.
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Affiliation(s)
- G Vampa
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - T J Hammond
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - N Thiré
- INRS-EMT, 1650 Boulevard Lionel-Boulet, CP 1020, Varennes, Québec J3X 1S2, Canada
| | - B E Schmidt
- INRS-EMT, 1650 Boulevard Lionel-Boulet, CP 1020, Varennes, Québec J3X 1S2, Canada
| | - F Légaré
- INRS-EMT, 1650 Boulevard Lionel-Boulet, CP 1020, Varennes, Québec J3X 1S2, Canada
| | - C R McDonald
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - T Brabec
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - D D Klug
- National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada
| | - P B Corkum
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
- National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada
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Abstract
A computational method for predicting the output of a focused laser differential interferometer (FLDI) given an arbitrary density field is presented. The method is verified against analytical predictions and experimental data. The FLDI simulation software is applied to the problem of measuring Mack-mode wave packets in a hypervelocity boundary layer on a 5° half-angle cone. The software is shown to complement experiments by providing the necessary information to allow quantitative density fluctuation magnitudes to be extracted from experimental measurements.
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Vampa G, Hammond TJ, Thiré N, Schmidt BE, Légaré F, McDonald CR, Brabec T, Corkum PB. Linking high harmonics from gases and solids. Nature 2015; 522:462-4. [PMID: 26108855 DOI: 10.1038/nature14517] [Citation(s) in RCA: 172] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Accepted: 04/27/2015] [Indexed: 11/09/2022]
Abstract
When intense light interacts with an atomic gas, recollision between an ionizing electron and its parent ion creates high-order harmonics of the fundamental laser frequency. This sub-cycle effect generates coherent soft X-rays and attosecond pulses, and provides a means to image molecular orbitals. Recently, high harmonics have been generated from bulk crystals, but what mechanism dominates the emission remains uncertain. To resolve this issue, we adapt measurement methods from gas-phase research to solid zinc oxide driven by mid-infrared laser fields of 0.25 volts per ångström. We find that when we alter the generation process with a second-harmonic beam, the modified harmonic spectrum bears the signature of a generalized recollision between an electron and its associated hole. In addition, we find that solid-state high harmonics are perturbed by fields so weak that they are present in conventional electronic circuits, thus opening a route to integrate electronics with attosecond and high-harmonic technology. Future experiments will permit the band structure of a solid to be tomographically reconstructed.
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Affiliation(s)
- G Vampa
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - T J Hammond
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - N Thiré
- INRS-EMT, 1650 boulevard Lionel-Boulet, CP 1020, Varennes, Québec J3X 1S2, Canada
| | - B E Schmidt
- INRS-EMT, 1650 boulevard Lionel-Boulet, CP 1020, Varennes, Québec J3X 1S2, Canada
| | - F Légaré
- INRS-EMT, 1650 boulevard Lionel-Boulet, CP 1020, Varennes, Québec J3X 1S2, Canada
| | - C R McDonald
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - T Brabec
- Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - P B Corkum
- 1] Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada [2] National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada
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Pappalardo RT, Vance S, Bagenal F, Bills BG, Blaney DL, Blankenship DD, Brinckerhoff WB, Connerney JEP, Hand KP, Hoehler TM, Leisner JS, Kurth WS, McGrath MA, Mellon MT, Moore JM, Patterson GW, Prockter LM, Senske DA, Schmidt BE, Shock EL, Smith DE, Soderlund KM. Science potential from a Europa lander. Astrobiology 2013; 13:740-773. [PMID: 23924246 DOI: 10.1089/ast.2013.1003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The prospect of a future soft landing on the surface of Europa is enticing, as it would create science opportunities that could not be achieved through flyby or orbital remote sensing, with direct relevance to Europa's potential habitability. Here, we summarize the science of a Europa lander concept, as developed by our NASA-commissioned Science Definition Team. The science concept concentrates on observations that can best be achieved by in situ examination of Europa from its surface. We discuss the suggested science objectives and investigations for a Europa lander mission, along with a model planning payload of instruments that could address these objectives. The highest priority is active sampling of Europa's non-ice material from at least two different depths (0.5-2 cm and 5-10 cm) to understand its detailed composition and chemistry and the specific nature of salts, any organic materials, and other contaminants. A secondary focus is geophysical prospecting of Europa, through seismology and magnetometry, to probe the satellite's ice shell and ocean. Finally, the surface geology can be characterized in situ at a human scale. A Europa lander could take advantage of the complex radiation environment of the satellite, landing where modeling suggests that radiation is about an order of magnitude less intense than in other regions. However, to choose a landing site that is safe and would yield the maximum science return, thorough reconnaissance of Europa would be required prior to selecting a scientifically optimized landing site.
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Affiliation(s)
- R T Pappalardo
- Planetary Sciences Section, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
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21
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Schmidt BE, Gause O, Hagemann F, Li S, Unrau W, Wöste L, Siebert T. Optimal white light control of the negative to neutral to positive charge transition (NeNePo) in the electronic manifold of the silver trimer. J Phys Chem A 2012; 116:11459-66. [PMID: 22954161 DOI: 10.1021/jp307197w] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Control over the electronic state of the Ag(3) cluster is approached via a progression of ultrafast photoinduced transitions within the full electronic manifold of the negative to the neutral and finally the cationic state of the system. High-bandwidth supercontinuum laser pulses ranging from 500 to 950 nm are employed for addressing the wide range of electronic resonance conditions associated with the ladder climbing process of a tandem photoelectron detachment and a resonance enhanced multiphoton ionization (REMPI). With the control of the phase over the full spectral envelope of the supercontinuum in a pulse shaper arrangement, pulse forms are generated with the aim of synchronizing ultrashort subpulse sequences to the characteristic dynamics of the system during charge reversal. Pulse forms ranging over several hundred femtoseconds in total duration and subpulse structures down to 15 fs duration with a variable spectral composition can be obtained for this purpose. A free optimization based on a closed-loop genetic algorithm is employed for ordering the subpulse sequences to match the structural evolution of the system. The effective control attainable in this scenario is evaluated in view of maintaining a defined sequence of electronic transitions within the complex dynamic response of the system during the photoexcitation. Further emphasis is made on analyzing the degree of control attainable in the nonlinear regime of multiphoton excitation at supercontinuum bandwidths.
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Affiliation(s)
- B E Schmidt
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
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