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Reports until 14:32, Thursday 04 December 2025
H1 SQZ (SQZ)
karmeng.kwan@LIGO.ORG - posted 14:32, Thursday 04 December 2025 (88364)
VOPO crystal mount stage test

[Sheila, Eric, Karmeng]

We checked the NLG of the OPO without cavity lock, threshold power is roughly at 3.7mW, at the same order as the test performed at MIT (E2500270)

Checked the crystal alignment, found 9 good dual resonant position, from -2689um to 1223um, with 490um separation between each point. Everything seems to be in a good position. 

Plus a clipped dual resonance position at -3190um. Crystal edge is roughly at 1500um and -3200um.

Red alignment does not shift between the various crystal position.

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