LIGO Document E1800040-v1

ECR: Increase Transimpedance for OPO TRANS DCPD

Document #:
LIGO-E1800040-v1
Document type:
E - Engineering documents
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Abstract:
The green light power in transmission of the OPO is ridiculously small, of the order 50nW, due to a mirror transmission coefficient that is only ~1 ppm. We propose to modify channel 1 of the Auxiliary Signals Concentrator 7 to be of the Baffle PD variant. This increases the maximum transimpedance gain from ~62 kOhm to 20 MOhm.
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ECR SQZ
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