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Parametric Excitation of Ultracold Sodium Atoms in an Optical Dipole Trap. PHOTONICS 2022. [DOI: 10.3390/photonics9070442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Parametric modulation is an effective tool to measure the trap frequency and investigate the atom dynamics in an optical dipole trap or lattices. Herein, we report on experimental research of parametric resonances in an optical dipole trap. By modulating the trapping potential, we have measured the atomic loss dependence on the frequency of the parametric modulations. The resonance loss spectra and the evolution of atom populations at the resonant frequency have been demonstrated and compared under three modulation waveforms (sine, triangle and square waves). A phenomenological theoretical simulation has been performed and shown good accordance with the observed resonance loss spectra and the evolution of atom populations. The theoretical analysis can be easily extended to a complex waveform modulation and reproduce enough of the experiments.
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Yuan JP, Ji ZH, Zhao YT, Chang XF, Xiao LT, Jia ST. Simple, reliable, and nondestructive method for the measurement of vacuum pressure without specialized equipment. APPLIED OPTICS 2013; 52:6195-6200. [PMID: 24085077 DOI: 10.1364/ao.52.006195] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Accepted: 07/31/2013] [Indexed: 06/02/2023]
Abstract
We present a simple, reliable, and nondestructive method for the measurement of vacuum pressure in a magneto-optical trap. The vacuum pressure is verified to be proportional to the collision rate constant between cold atoms and the background gas with a coefficient k, which can be calculated by means of the simple ideal gas law. The rate constant for loss due to collisions with all background gases can be derived from the total collision loss rate by a series of loading curves of cold atoms under different trapping laser intensities. The presented method is also applicable for other cold atomic systems and meets the miniaturization requirement of commercial applications.
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Telles GD, Bagnato VS, Marcassa LG. Alternative to the hyperfine-change-collision interpretation for the behavior of magneto-optical-trap losses at low light intensity. PHYSICAL REVIEW LETTERS 2001; 86:4496-4499. [PMID: 11384267 DOI: 10.1103/physrevlett.86.4496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2000] [Indexed: 05/23/2023]
Abstract
Usually, the large trap loss rates observed in MOTs at the low light intensity regime have been associated with hyperfine change collisions (HCC). We propose an alternative mechanism to explain the sudden raise up of trap loss rates at low intensity without relying on HCC. Using the Gallagher-Pritchard model [Phys. Rev. Lett. 63, 957 (1989)] together with an intensity dependent escape velocity, we were able to reproduce qualitatively well some existing experimental results, including recent observations by Nesnidal et al. [Phys. Rev. A 62, 030701(R) (2000)]. This result reopens the discussion in order to better understand the physical mechanisms and their actual contribution to the trap losses.
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Affiliation(s)
- G D Telles
- Instituto de Física de São Carlos, Universidade de São Paulo, Caixa Postal 369, 13560-970, São Carlos-SP, Brazil
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Wilkowski D, Ringot J, Hennequin D, Garreau JC. Instabilities in a magneto-optical trap: noise-induced dynamics in an atomic system. PHYSICAL REVIEW LETTERS 2000; 85:1839-42. [PMID: 10970627 DOI: 10.1103/physrevlett.85.1839] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/1999] [Indexed: 05/22/2023]
Abstract
The instabilities observed in the atomic cloud of a magneto-optical trap are experimentally studied through the dynamics of the center of mass location and the cloud population. Two dynamical components are identified: a slow, stochastic one affects both variables, and a fast, deterministic one affects only the center of mass location. A one-dimensional stochastic model taking into account the shadow effect is developed from these observations and reproduces the experimental behavior. It is shown that instabilities are driven by noise and present stochastic resonancelike characteristics.
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Affiliation(s)
- D Wilkowski
- Laboratoire de Physique des Lasers, Atomes et Molecules, Unite mixte du Centre National de la Recherche Scientifique, Centre d'Etudes et de Recherches Lasers et Applications, Batiment P5, Universite des Sciences et Technologies de Li
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Flemming J, Marcassa LG, Horowicz RJ, Zilio SC, Bagnato VS. Enhanced loading of a two-color vapor-cell magneto-optical trap for sodium atoms. OPTICS LETTERS 1995; 20:2529. [PMID: 19865275 DOI: 10.1364/ol.20.002529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
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Solts R, Ben-Reuven A, Julienne PS. Optical collisions in ultracold atom traps: Two-photon distorted-wave theory. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1995; 52:4029-4042. [PMID: 9912717 DOI: 10.1103/physreva.52.4029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Pax P, Lenz G, Meystre P. Dipole-dipole interaction in the near-resonant Kapitza-Dirac effect. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1995; 51:3972-3981. [PMID: 9912070 DOI: 10.1103/physreva.51.3972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Wallace CD, Sanchez-Villicana V, Dinneen TP, Gould PL. Suppression of trap loss collisions at low temperature. PHYSICAL REVIEW LETTERS 1995; 74:1087-1090. [PMID: 10058931 DOI: 10.1103/physrevlett.74.1087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Ritchie NW, Abraham ER, Xiao YY, Bradley CC, Hulet RG, Julienne PS. Trap-loss collisions of ultracold lithium atoms. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1995; 51:R890-R893. [PMID: 9911776 DOI: 10.1103/physreva.51.r890] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Suominen KA, Holland MJ, Burnett K, Julienne P. Optical shielding of cold collisions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1995; 51:1446-1457. [PMID: 9911730 DOI: 10.1103/physreva.51.1446] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Shang SQ, Lu ZT, Freedman SJ. Comparison of the cold-collision losses for laser-trapped sodium in different ground-state hyperfine sublevels. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1994; 50:R4449-R4452. [PMID: 9911547 DOI: 10.1103/physreva.50.r4449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Katori H, Shimizu F. Laser-induced ionizing collisions of ultracold krypton gas in the 1s5 metastable state. PHYSICAL REVIEW LETTERS 1994; 73:2555-2558. [PMID: 10057090 DOI: 10.1103/physrevlett.73.2555] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Marcassa L, Muniz S, Zilio S, Bagnato V, Weiner J, Julienne PS, Souminen K. Optical suppression of photoassociative ionization in a magneto-optical trap. PHYSICAL REVIEW LETTERS 1994; 73:1911-1914. [PMID: 10056920 DOI: 10.1103/physrevlett.73.1911] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Band YB, Tuvi I, Suominen K, Burnett K, Julienne PS. Loss from magneto-optical traps in strong laser fields. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1994; 50:R2826-R2829. [PMID: 9911322 DOI: 10.1103/physreva.50.r2826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Peters MG, Hoffmann D, Tobiason JD, Walker T. Laser-induced ultracold Rb(5S1/2)+Rb(5P1/2) collisions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1994; 50:R906-R909. [PMID: 9911104 DOI: 10.1103/physreva.50.r906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Julienne PS, Suominen KA, Band Y. Complex-potential model of collisions of laser-cooled atoms. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1994; 49:3890-3896. [PMID: 9910686 DOI: 10.1103/physreva.49.3890] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Dulieu O, Julienne P, Weiner J. Accuracy of molecular data in the understanding of ultracold collisions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1994; 49:607-610. [PMID: 9910270 DOI: 10.1103/physreva.49.607] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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