Experiments to Control Atom Number and Phase-Space Density in ...
Experiments to Control Atom Number and Phase-Space Density in ...
Experiments to Control Atom Number and Phase-Space Density in ...
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5 2 P 3/2<br />
5 2 S 1/2<br />
384. 230 484 468 5(62) THz<br />
780. 241 209 686(13) nm<br />
Absorption Imag<strong>in</strong>g / Push Beam<br />
MOT Beam<br />
Molasses Beam<br />
266.6500(90) MHz<br />
156.9470(70) MHz<br />
72.2180(40) MHz<br />
6.834 682 610 904 290(90) GHz<br />
Figure 4.6: Near-resonant laser frequencies used dur<strong>in</strong>g the s<strong>in</strong>gle-pho<strong>to</strong>n cool<strong>in</strong>g experiment.<br />
Figure courtesy of Travis Bannerman.<br />
configuration [72], referred <strong>to</strong> as MOT master laser <strong>and</strong> repump laser. Each of them<br />
is locked <strong>in</strong>dividually <strong>to</strong> the absorption l<strong>in</strong>e of rubidium us<strong>in</strong>g saturated absorption<br />
spectroscopy. Unfortunately these diode lasers do not provide sufficient power for the<br />
experiment. Three <strong>in</strong>jection-locked slave lasers seeded by the MOT master laser generate<br />
adequate power. Further changes of the laser frequencies are accomplished us<strong>in</strong>g acous<strong>to</strong>-<br />
optic modula<strong>to</strong>rs (AOMs).<br />
4.3.1.1 MOT Master Laser<br />
Optical Pump<strong>in</strong>g Beam<br />
The MOT master laser, shown <strong>in</strong> figure 4.7, was built for <strong>and</strong> used <strong>in</strong> a previous<br />
experiment [73]. It is an external cavity diode laser (ECDL) <strong>in</strong> Littrow-configuration.<br />
52<br />
Demon Beam<br />
Repump Beam<br />
F=3<br />
F=2<br />
F=1<br />
F=0<br />
F=2<br />
F=1