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Reports until 18:13, Thursday 26 July 2012
H2 ISC
eleanor.king@LIGO.ORG - posted 18:13, Thursday 26 July 2012 (3616)
Optimising ALS green laser doubler crystal temperature

Bram, Alberto, Elli.  We set the green laser doubler crystal temperature to maximise the green laser power output.  The laser diode current was 1.725A and the 1064 laser crystal was 42.05 degrees C.  We varied the doubler crystal temperature and measured the power output.  Attached is a plot of these measurements.  The green laser power was maximised when the doubler crystal temperature was set to 34.37 degrees C.

 

When the doubler crystal temp was 34.37 degrees C:

(with 1.725A input current, 42.05 degrees C crystal temp)

-The laser power output was measured at 41.9mW

-GR_PWR_MON read 8400 counts

-REFL_PWR_MON read 15500 counts, and we measured 1.22mW, 4.8V, and a gain setting of 20dB at this PD.

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