Torrey Cullen - posted 11:47, Monday 17 June 2024 - last comment - 15:49, Monday 17 June 2024(11662)
New 775 FC REFL PD
I have taken a thorlabs PDA10A2 from the recent large thorlabs purchase to use as the REFL PD on the 775 FC path. Previously the PD in use was an 1811 which has very low responsivity at this wavelength. Set it up, realigned, and we have a much better PDH signal (more prominent sidebands, larger PDH error amp/locked RMS ratio, etc).
Images attached to this report
Comments related to this report
The 1811 PD is currently on the optics table underneath the foil covering the non-superoptic piezo mirrors.
We have put the other PDA10A2 in transmission of the FC temporarily to take some measurements. Long term this is the REFL PD for the laser filter cavity.