SQZT0 PMC Motivation and a Potential Mode Matching Solution

Document #:

LIGO-T2300300-v5

Document type:

T - Technical notes

Abstract:

Since O3 we haven t been able to increase the CLF power without destroying the amount of squeezing. Low CLF power results in a marginal SQZ 3MHz LO loop. A squeezer laser intensity noise measurement showed that our laser intensity noise was not as good as the Mephisto documentation claimed to be (alog68991). We then injected a frequency dependent squeezing with a high CLF power and showed that the squeezer laser intensity noise could
indeed be the limiting factor (alog69084). Hence, we proposed adding a mode cleaner on the SQZT0 to mitigate the CLF intensity noise.

Files in Document:

• SQZT0_PMC_motivation_and_a_potential_mode_matching_sol...pdf (4.5 MB)

Topics:

• Squeezer

Author Groups:

• LSC

Keywords:

squeezing CLF intensity noise PMC

Notes and Changes:

- Added Vicky's PMC measurements from MIT
- Added LHO table layout (Fig.16)

Referenced by:

• LIGO-E2300300: aLIGO, SQZ, Squeezer Mode Cleaner