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Entry  Tue Jan 4 18:26:59 2022, Anchal, Update, BHD, Tested 2" PR2 candidates transmission 
    Reply  Wed Jan 5 17:46:04 2022, Anchal, Update, BHD, Tested 2" PR2 candidates transmission 
       Reply  Mon Jan 10 18:20:45 2022, Anchal, Update, BHD, Tested 2" PR2 candidates transmission 
          Reply  Tue Jan 11 15:21:16 2022, Anchal, Update, BHD, PR2 transmission calculation LO_power_vs_PR2_transmission.pdfPRC_Gain_vs_PR2_transmission.pdfPRS_Trans_Calc.ipynb.zip
             Reply  Thu Jan 13 17:10:55 2022, Anchal, Update, BHD, PR2 transmission calculation LO_power_vs_PR2_transmission.pdfPRC_Gain_vs_PR2_transmission.pdfPR2_Trans_Calc.ipynb.zip
                Reply  Fri Jan 14 03:07:04 2022, Koji, Update, BHD, PR2 transmission calculation 
                   Reply  Fri Jan 14 11:00:29 2022, Anchal, Update, BHD, PR2 transmission calculation 
                      Reply  Fri Jan 14 13:46:25 2022, Anchal, Update, BHD, PR2 transmission calculation updated LO_power_vs_PR2_transmission.pdfPRC_Gain_vs_PR2_transmission.pdfPR2_Trans_Calc.ipynb.zip
                         Reply  Wed Jan 19 16:22:48 2022, Anchal, Update, BHD, PR2 transmission calculation updated PR2transmissionSelectionAnalysis.pdfPR2_Trans_Calc.ipynb.zip
                            Reply  Thu Jan 20 01:48:02 2022, Koji, Update, BHD, PR2 transmission calculation updated 
Message ID: 16566     Entry time: Mon Jan 10 18:20:45 2022     In reply to: 16543     Reply to this: 16575
Author: Anchal 
Type: Update 
Category: BHD 
Subject: Tested 2" PR2 candidates transmission 

I tested 2 more optics found by Paco and Yehonathan in QIL.

  Polarization Incident Power [mW] Transmitted Power [mW] Transmission [ppm]
V6-704 V6-706 p-pol 850 17.1 20118
Yellow cylindrical box p-pol 850 <1 ( could not even see it to measure it with a more sensitive power meter) <1000

I would like someone to redo the second test. I'm not sure what was happening but I could not find the transmitted beam at all on my card even with all lights out. This is either too good a coating and not useful for us or I did something wrong while measuring it.

V6-704, V6-706 mirror seemed like a good candidate as the paper with it said it would be a 200 ppm mirror. But I measured a lot more transmission than that. Now that I see that paper more carefully, it is a 45 degree s-pol mirror, probably that's why it had so much transmission for p-pol at near-normal incidence.

 

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