Modeling the evaporative cooling of fermionic atoms in an optical trap

Kenneth O'Hara, S. R. Granade, M. E. Gehm, M. S. Chang, J. E. Thomas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Summary form only given. Evaporative cooling of atoms in an optical trap has recently received renewed attention as a means for obtaining degeneracy in an optically trapped bosonic Cs vapor as well as a fermionic Li gas. We have developed a new model describing the evaporative cooling process for atoms confined in a time-dependent optical potential formed by a single focused Gaussian laser beam. We find that a substantial increase in the phase-space density can be obtained by adiabatically reducing the trap laser power and thereby the trap well depth as a function of time. Since we are specifically interested in the evaporative cooling of fermionic 6Li atoms, we have included the effect of Fermi statistics in the model. Although the collision rate is suppressed as the temperature T is reduced below the Fermi temperature TF, we find that values of T/TF蠐1 can be achieved for suitable initial conditions.

Original languageEnglish (US)
Title of host publicationTechnical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages1
ISBN (Electronic)155752663X, 9781557526632
DOIs
StatePublished - Jan 1 2001
EventQuantum Electronics and Laser Science Conference, QELS 2001 - Baltimore, United States
Duration: May 6 2001May 11 2001

Other

OtherQuantum Electronics and Laser Science Conference, QELS 2001
CountryUnited States
CityBaltimore
Period5/6/015/11/01

Fingerprint

evaporative cooling
traps
Cooling
Atoms
atoms
collision rates
space density
Laser beams
Vapors
Statistics
statistics
laser beams
vapors
Temperature
temperature
Lasers
Gases
gases
lasers

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Radiation

Cite this

O'Hara, K., Granade, S. R., Gehm, M. E., Chang, M. S., & Thomas, J. E. (2001). Modeling the evaporative cooling of fermionic atoms in an optical trap. In Technical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001 [962209] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/QELS.2001.962209
O'Hara, Kenneth ; Granade, S. R. ; Gehm, M. E. ; Chang, M. S. ; Thomas, J. E. / Modeling the evaporative cooling of fermionic atoms in an optical trap. Technical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001. Institute of Electrical and Electronics Engineers Inc., 2001.
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O'Hara, K, Granade, SR, Gehm, ME, Chang, MS & Thomas, JE 2001, Modeling the evaporative cooling of fermionic atoms in an optical trap. in Technical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001., 962209, Institute of Electrical and Electronics Engineers Inc., Quantum Electronics and Laser Science Conference, QELS 2001, Baltimore, United States, 5/6/01. https://doi.org/10.1109/QELS.2001.962209

Modeling the evaporative cooling of fermionic atoms in an optical trap. / O'Hara, Kenneth; Granade, S. R.; Gehm, M. E.; Chang, M. S.; Thomas, J. E.

Technical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001. Institute of Electrical and Electronics Engineers Inc., 2001. 962209.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - Summary form only given. Evaporative cooling of atoms in an optical trap has recently received renewed attention as a means for obtaining degeneracy in an optically trapped bosonic Cs vapor as well as a fermionic Li gas. We have developed a new model describing the evaporative cooling process for atoms confined in a time-dependent optical potential formed by a single focused Gaussian laser beam. We find that a substantial increase in the phase-space density can be obtained by adiabatically reducing the trap laser power and thereby the trap well depth as a function of time. Since we are specifically interested in the evaporative cooling of fermionic 6Li atoms, we have included the effect of Fermi statistics in the model. Although the collision rate is suppressed as the temperature T is reduced below the Fermi temperature TF, we find that values of T/TF蠐1 can be achieved for suitable initial conditions.

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O'Hara K, Granade SR, Gehm ME, Chang MS, Thomas JE. Modeling the evaporative cooling of fermionic atoms in an optical trap. In Technical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001. Institute of Electrical and Electronics Engineers Inc. 2001. 962209 https://doi.org/10.1109/QELS.2001.962209