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Entry  Thu Jun 7 10:26:36 2018, keerthana, Update, PSL, observing the resonance signal corresponding to the injected frequency. photodetector_alignment.jpgdesign1.PNG
    Reply  Thu Jun 7 22:36:09 2018, not keerthana, Update, PSL, observing the resonance signal corresponding to the injected frequency. 
    Reply  Fri Jun 8 00:36:54 2018, gautam, Update, PSL, observing the resonance signal corresponding to the injected frequency. 
    Reply  Fri Jun 8 01:08:22 2018, johannes, Update, PSL, First light of AUX at YEND AG4395A_07-06-2018_205019.pdfPSL_AUX_SETUP.pdfAS_AUX_SETUP.pdf
       Reply  Mon Jun 18 14:32:42 2018, gautam, Update, PSL, Optics on AS table 
          Reply  Mon Jun 18 15:59:17 2018, johannes, Update, PSL, Optics on AS table 
             Reply  Mon Jun 18 16:57:54 2018, Koji, Update, PSL, Optics on AS table 
             Reply  Fri Jun 22 14:18:04 2018, Steve, Update, PSL, Optics on AS table 
Message ID: 13982     Entry time: Mon Jun 18 15:59:17 2018     In reply to: 13981     Reply to this: 13983   14006
Author: johannes 
Type: Update 
Category: PSL 
Subject: Optics on AS table 
Quote:

Furthermore, I believe we are losing more than 10% of the light due to this BS. The ASDC (which is derived from AS55 PD) level is down at ~110cts as the Michelson is fringing, while it used to be ~200 cts. I will update with a power measurement shortly. But I think we should move ahead with the plan to combine the beam into the IFO's AS mode as discussed at the meeting last week.

Is the 10% specified for P-Pol or for UNP? I contacted CVI about beamsplitters, since their website doesn't list a BS1-1064-90-... option on the website. They say a R=90% beamsplitter would be a custom job. The closest stock item they got is BS1-1064-95-2025-45UNP specified at R=95% for UNPolarized beams. They were kind enough to sent me the measured transmission curves for a recent lot of these, which is attached was uploaded to the wiki [Elog Police K: NO PROPRIETARY DOCUMENTS ON THE ELOG, which is public. Put it on our wiki and put the link here]. The figure is not labeled, but according to the contact Red is S-Pol and Blue is P-Pol, which means that this one actually has R=~90% for P, pretty much what we want. We'll need to buy two of these to make the swap in the setup.

Back to your original point: There's only a BS1-1064-10-2025-45UNP on the website, so unless we got these as custom items, the R for P-Pol is probably NOT actually 10%, just somewhere between 0% and 20%

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