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FMCG/Operating procedure: Difference between revisions
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# On the array, switch the detectors to SUM mode. This is accomplished by moving both the 4-socket leads from the detector and the 2-socket leads that carry signals out of the room to the set of header pins denoted by a '''Σ''' or '''+''' label.
# If not done already, turn on the TEC and LD for the probe laser diode (the right-hand SRS LDC501 controller). We have historically and recently run at 170.00 mA of laser diode drive current on the probe. With this drive current, the D2 absorption line occurs at a "temperature" of roughly 7.05 kΩ and we generally do our magnetometry at a temperature of 8.5-9.5 kΩ.
# Now return to the rear of the rack and, after verifying the probe tapered amplifier TEC 2000 temperature controller is enabled, enable the probe tapered amplifier output by pressing the '''output''' button on the Newport Model 560B driver. The drive current on the TA sets the eventual light intensity on the detectors. Historically, we have worked with currents as high as 1200 mA, though recently we have worked at much lower values around 750 mA, which delivers ~500 μW of laser power through a hot cell to the detector.
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