J. Reichel et al., RAMAN COOLING OF CESIUM BELOW 3 NK - NEW APPROACH INSPIRED BY LEVY FLIGHT STATISTICS, Physical review letters, 75(25), 1995, pp. 4575-4578
We present a new approach to optimize subrecoil Raman cooling, based o
n Levy flight statistics. It shows that simple time sequences using sq
uare pulses can lead to very efficient cooling. We tested the method i
n a one-dimensional experiment with cesium atoms and obtained temperat
ures below 3 nK, less than 1/70 of the single photon recoil temperatur
e.