Single-Photon Atomic Cooling - Raizen Lab - The University of ...
Single-Photon Atomic Cooling - Raizen Lab - The University of ...
Single-Photon Atomic Cooling - Raizen Lab - The University of ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
<strong>The</strong> holder is placed into a bronze mounting block. Below the mounting block<br />
is a TEC, which is used to control the temperature <strong>of</strong> the laser diode in con-<br />
junction with a thermistor and temperature controller, see Fig. 3.11. <strong>The</strong><br />
injection current into each diode is controlled with a PID loop identical to<br />
aluminum<br />
housing<br />
Brewster<br />
window<br />
diode in<br />
coll. tube<br />
and<br />
bronze holder<br />
mounting<br />
block<br />
Figure 3.11: A slave laser used in the experiment to generate sufficient resonant<br />
light. <strong>The</strong> left image shows the laser with its aluminum housing in place. <strong>The</strong><br />
right image is taken without the aluminum housing, revealing the laser diode<br />
and mounting block.<br />
that used in the MOT master laser.<br />
Injection locking is accomplished by seeding the free-running diode<br />
lasers with a weak beam spatially matched to the diode laser output. We<br />
seed a small amount <strong>of</strong> light (∼ 2 mW) from the MOT master laser beam into<br />
each slave laser. This is done by using the optical isolators (ConOptics: 713B)<br />
placed after each slave laser. <strong>The</strong> seed light is sent into the rejection port <strong>of</strong><br />
each optical isolator collinear to the rejected portion <strong>of</strong> the beam from the<br />
slave lasers as shown in Fig. 3.12. Because optical isolators utilize Faraday<br />
rotation to work, they rotate the polarization <strong>of</strong> light passing though them<br />
in the same direction regardless <strong>of</strong> the direction <strong>of</strong> travel. <strong>The</strong>refore the seed<br />
106