Scaling laws for evaporative cooling in time-dependent optical traps

K. M. O’Hara, M. E. Gehm, S. R. Granade, J. E. Thomas

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We derive scaling laws for the number of atoms, collision rate, and phase-space density as a function of trap depth for evaporative cooling in an adiabadically lowered optical trap. The results are in excellent agreement with a Boltzmann equation model and show that very large increases in phase-space density can be obtained without excessive slowing of the evaporation rate. Predictions are in reasonable agreement with a recent experiment that achieves Bose-Einstein condensation by evaporation in an optical trap. We also discuss evaporation of fermionic mixtures and explain why Pauli blocking does not strongly inhibit cooling.

Original languageEnglish (US)
Number of pages1
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number5
StatePublished - Jan 1 2001

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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