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Boltaev GS, Ganeev RA, Alnaser AS. Enhanced XUV harmonics generated in mixed noble gases using three-color laser fields. OPTICS EXPRESS 2024; 32:113-124. [PMID: 38175043 DOI: 10.1364/oe.507586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 11/24/2023] [Indexed: 01/05/2024]
Abstract
High repetition coherent extreme ultraviolet (XUV) harmonics offer a powerful tool for investigating electron dynamics and understanding the underlying physics in a wide range of systems. We demonstrate the utilization of combined three-color (ω+2ω+3ω) laser fields in the generation of coherent extreme ultraviolet radiation in mixed noble gases. The three-color field results from the combination of fundamental, second-, and third-order harmonics of the near-infrared laser pulses in the nonlinear crystals. Different noble gases were selected as gas targets based on their ionization potentials, which are important parameters for generating higher cut-offs and intensities for the XUV harmonics. Enhanced XUV harmonic intensities were observed in the mixture of He + Kr gases when using three-color laser fields, compared to harmonics generated in the He + Kr mixture under a single-color pump. On the other hand, suppression of XUV harmonic intensity was observed in the mixture of He + Xe under the three-color pump due to the highest ionization level for these two mixed gases at similar laser conditions. Strong harmonic yields in the range of 25 to 80 eV of photon energy were observed.
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Filus Z, Ye P, Csizmadia T, Grósz T, Gulyás Oldal L, De Marco M, Füle M, Kahaly S, Varjú K, Major B. Liquid-cooled modular gas cell system for high-order harmonic generation using high average power laser systems. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:073002. [PMID: 35922325 DOI: 10.1063/5.0097788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 06/15/2022] [Indexed: 06/15/2023]
Abstract
We present the design and implementation of a new, modular gas target suitable for high-order harmonic generation using high average power lasers. To ensure thermal stability in this high heat load environment, we implement an appropriate liquid cooling system. The system can be used in multiple-cell configurations, allowing us to control the cell length and aperture size. The cell design was optimized with heat and flow simulations for thermal characteristics, vacuum compatibility, and generation medium properties. Finally, the cell system was experimentally validated by conducting high-order harmonic generation measurements using the 100 kHz high average power HR-1 laser system at the Extreme Light Infrastructure Attosecond Light Pulse Source (ELI ALPS) facility. Such a robust, versatile, and stackable gas cell arrangement can easily be adapted to different experimental geometries in both table-top laboratory systems and user-oriented facilities, such as ELI ALPS.
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Affiliation(s)
- Zoltán Filus
- ELI ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner utca 3, Szeged H-6728, Hungary
| | - Peng Ye
- ELI ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner utca 3, Szeged H-6728, Hungary
| | - Tamás Csizmadia
- ELI ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner utca 3, Szeged H-6728, Hungary
| | - Tímea Grósz
- ELI ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner utca 3, Szeged H-6728, Hungary
| | - Lénárd Gulyás Oldal
- ELI ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner utca 3, Szeged H-6728, Hungary
| | - Massimo De Marco
- ELI ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner utca 3, Szeged H-6728, Hungary
| | - Miklós Füle
- ELI ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner utca 3, Szeged H-6728, Hungary
| | - Subhendu Kahaly
- ELI ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner utca 3, Szeged H-6728, Hungary
| | - Katalin Varjú
- ELI ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner utca 3, Szeged H-6728, Hungary
| | - Balázs Major
- ELI ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner utca 3, Szeged H-6728, Hungary
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Goldberger D, Schmidt D, Barolak J, Ivanic B, Durfee CG, Adams DE. Spatiospectral characterization of ultrafast pulse-beams by multiplexed broadband ptychography. OPTICS EXPRESS 2021; 29:32474-32490. [PMID: 34615317 DOI: 10.1364/oe.433752] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 09/10/2021] [Indexed: 06/13/2023]
Abstract
Ultrafast pulse-beam characterization is critical for diverse scientific and industrial applications from micromachining to generating the highest intensity laser pulses. The four-dimensional structure of a pulse-beam, E~(x,y,z,ω), can be fully characterized by coupling spatiospectral metrology with spectral phase measurement. When temporal pulse dynamics are not of primary interest, spatiospectral characterization of a pulse-beam provides crucial information even without spectral phase. Here we demonstrate spatiospectral characterization of pulse-beams via multiplexed broadband ptychography. The complex spatial profiles of multiple spectral components, E~(x,y,ω), from modelocked Ti:sapphire and from extreme ultra-violet pulse-beams are reconstructed with minimum intervening optics and no refocusing. Critically, our technique does not require spectral filters, interferometers, or reference pulses.
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