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Entry  Sat May 9 17:01:08 2020, Yehonathan, Update, Loss Measurement, 40m Phase maps loss estimation ITMX_Loss_Map.pdfETMX_Loss_Map.pdfITMX_Phase_Map_(nm).pdfETMX_Phase_Map_(nm).pdf
    Reply  Wed May 13 15:13:11 2020, Yehonathan, Update, Loss Measurement, 40m Phase maps loss estimation ITMX_Loss_Map.pdfETMX_Loss_Map.pdf
       Reply  Thu May 14 12:21:56 2020, Yehonathan, Update, Loss Measurement, 40m Phase maps loss estimation ITMX_Loss_Map_Perturbation_Theory.pdfETMX_Loss_Map_Perturbation_Theory(1).pdf
          Reply  Thu May 14 19:00:43 2020, Yehonathan, Update, Loss Measurement, 40m Phase maps loss estimation 
             Reply  Tue May 19 15:39:04 2020, Yehonathan, Update, Loss Measurement, 40m Phase maps loss estimation Mode_power_fraction1.pdf
Message ID: 15338     Entry time: Tue May 19 15:39:04 2020     In reply to: 15333
Author: Yehonathan 
Type: Update 
Category: Loss Measurement 
Subject: 40m Phase maps loss estimation 

I have a serious concern about this low angle scattering analysis:

Phase maps perturb the spatial mode of the steady-state of the cavity, but how is this different than mode-mismatch? The loss that I calculated is an overall loss, not roundtrip loss.

The only way I can think this can become serious loss is when the HOMs themselves have very high roundtrip loss. Attached is the modal power fraction that I calculated.

 

Attachment 1: Mode_power_fraction1.pdf  12 kB  Uploaded Tue May 19 20:10:38 2020  | Hide | Hide all
Mode_power_fraction1.pdf
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