Dan Brown, TVo

We played around with the differential lensing (~+/- 40 udiopters in diff) and looking at the AS port with the OSA and the OMC mode scanning  to better balance the 9MHz sidebands, but unfortunately DRMI lost lock during our thermal transient and it was very difficult to recover even after re-aligning the corner optics, so we decided to move the CO2 settings back to the beginning of the day. 

Then we were able to do a SQZ single bounce off both ITMs and found that they were mode matched to around 99% on both optics.  Even though the sideband imbalance might not be great, the DRMI locks more readily with these settings (see below), and the SQZer seems to like this pre-loading state.  There may be a possibility that the IFO requires a different substrate lens than the squeezer in order to mode match well, this is still under investigation.  It's not clear to me how sensitive the squeezer is to the ITM substrate lensing, given an opportunity, we should try to constrain this better by measuring the response of the 02 peak in the OMC scans as we're changing the CO2 power.  We can also try to get the sideband imbalance better at the AS port and then re-measure the squeezer.

RH_X: 1.12 W (total)

CO2_X: 1.06 W

RH_Y: 5.24 W (total)

CO2Y: 1.78 Watts