Reports until 18:42, Thursday 24 February 2022
H1 SQZ
georgia.mansell@LIGO.ORG - posted 18:42, Thursday 24 February 2022 (61904)
Laser work in HAM7 - Angled H:PD, seed power measurements

Dhruva, Vicky, Austin, Georgia

Today we did a couple more laser hazard tasks in HAM7.

H:PD1

We angled H:PD1 to follow up on Robert's scatter concerns, first attachment is the PD before, second attachment is after. We used the last two adjustable dog clamps from Camilla's supply to bolt the PD in its new orientation. Dhruv took a peek in the viewport with Robert's IR flashlight and camera set up, see third attachment for the before pic and fourth and fifth for after pics.

Seed power measurements

We measured the seed power into the fiber, on reflection of the OPO at the viewport, and on transission of the OPO at the viewport. This ratio should stay the same during pump down but we want to keep an eye on it.

Into the seed fiber: 11mW (16 on the MEDM seed power mon)

Seed refl at the periscope: 2.5 mW

Seed transmisison off beam diverter: 97 uW

 

Images attached to this report