Reports until 16:46, Wednesday 17 December 2025
H1 SQZ
eric.oelker@LIGO.ORG - posted 16:46, Wednesday 17 December 2025 (88582)
VOPO Pump Aligned

[Daniel D, Kar Meng, Sheila, Eric]

Today we continued with the VOPO install.  The pump beam is now aligned to the cavity.  Unfortunately, the cavity axis was different enough that we had to walk things quite a bit to optimize the alignment.  We double checked the mode matching for the pump path with the new cavity and it is sitting at around 85% with 15% in the bullseye mode.  

We also roughly aligned the CLF path by aligning the CLF reflection to the green transmission.  We then switched to the seed beam with the injection power turned up all the way and were able to see a beam on the card when the cavity is scanning.  Currently, the transmitted beam is clipping on SFI 1.  We will continue with the alignment tomorrow and finish optimizing the seed beam once we can get far enough down the SQZ path to reach a PD.