[Nergis, Sheila, Haocun]

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

Main steps:

• Set a temperature in s step of 1 degree around 33C.
• Move the crystal in a step of 50 or 100 counts (10 for fine adjustments) to achieve dual resonance, and lock the cavity. (E)
• Scanning the seed 
• Fine adjust the temperature to maximize non-linear gain.

Green power before the fiber coupler on ISCT6: 18mW

OPO REFL: 7mW

Measurements:

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

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