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haocun.yu@LIGO.ORG - posted 14:41, Tuesday 07 August 2018 - last comment - 08:47, Saturday 18 August 2018(43292)
Optimization of OPO Crystal Position

[Nergis, Sheila, Haocun]

Yesterday we did the measurements for optimizing the OPO crystal position.

Main steps:

Green power before the fiber coupler on ISCT6: 18mW

OPO REFL: 7mW

Measurements:

Temperature (C) NLG
34.83 3.3
33.85 4.8
32.95 5.13
31.985 4.38
32.4 5.28
32.236 4.095

 

The plot with a sinc2 fitting is attached as below, some measurements drop off the fitting, but we have a rough optimized position and temperature for the crystal: ~33 C

From this, we calculated the threshold power is 22mW at the OPO input.

 

References:

Crystal Translation Stage manual Q521

Lasti ilog Maggie

Comments related to this report
haocun.yu@LIGO.ORG - 08:47, Saturday 18 August 2018 (43507)SQZ

Plot of NLG vs. Crystal Temperature added.

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