Multi frequency evaporative cooling to BEC in a high magnetic field

Details Multi frequency evaporative cooling to BEC in a high magnetic field Multi frequency evaporative cooling to BEC in a high magnetic field

2000-05-05

arxiv.org/abs/physics/0005014v2

Phys. Rev. A (rapid comm.), 62, 021601(R)1-4 (2000).

Physics

Atomic Physics

12 pages, 2 figures

Scientific paper

10.1103/PhysRevA.62.021601

We demonstrate a way to circumvent the interruption of evaporative cooling observed at high bias field for $^{87}$Rb atoms trapped in the (F=2, m=+2) ground state. Our scheme uses a 3-frequencies-RF-knife achieved by mixing two RF frequencies. This compensates part of the non linearity of the Zeeman effect, allowing us to achieve BEC where standard 1-frequency-RF-knife evaporation method did not work. We are able to get efficient evaporative cooling, provided that the residual detuning between the transition and the RF frequencies in our scheme is smaller than the power broadening of the RF transitions at the end of the evaporation ramp.

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