By Kirk W Madison, Kai Bongs, Lincoln D Carr, Ana Maria Rey, Hui Zhai
The purpose of this e-book is to give evaluation articles describing the newest theoretical and experimental advancements within the box of chilly atoms and molecules. Our wish is this sequence will advertise learn by way of either highlighting contemporary breakthroughs and by way of outlining one of the most promising study instructions within the field.
Readership: examine scientists together with graduate scholars and top point undergraduate scholars.
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Extra info for Annual Review of Cold Atoms and Molecules, volume 2
3. The trap consists of a 1065-nm laser beam propagating horizontally. The beam profile is strongly elliptic, with a beam waist of 300 µm in the transverse horizontal direction and 17 µm along the field of gravity. The depth of the reservoir trap is kept constant at k B × 9 µK. After February 25, 2014 14:50 Annual Review of Cold Atoms and Molecules, Volume 2 32 9inx6in b1749-ch01 S. Stellmer, F. Schreck & T. C. 3 mm (e) P1 1 S0 energy 3 reservoir dimple y (f) y z x Fig. 9. Scheme to reach quantum degeneracy by laser cooling.
The figure is taken from Ref. 76. observe that 140 ms later, an additional, central elliptical feature has developed; see Fig. 10(b). This is the hallmark of the BEC, which appears about 60 ms after ramping up the dimple. 1 × 105 after 150 ms. The atom number in the reservoir decreases slightly, initially because of migration into the dimple and on longer timescales because of light assisted loss processes in the laser cooled cloud. We carefully check that evaporation of atoms out of the dimple region is negligible even for the highest temperatures of the gas.
For each shell, sat ≈ , where is the natural and sat = 1 + s the intensity-broadened linewidth. In a second phase, we narrow the scan range down to 2 MHz, where the comb line closest to resonance is 100 kHz red-detuned to the transition. During this phase of 200 ms, the total light intensity is reduced to about 100 Isat (corresponding to about Isat per comb line), and the magnetic field gradient remains unchanged. Afterwards, we jump to single-frequency operation with a detuning of −800 kHz and an unchanged intensity of 100 Isat .