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Entry  Tue Feb 25 00:00:01 2014, rana, jenne, Update, LSC, reasons that the REFL signals may be degenerate now 
    Reply  Tue Feb 25 02:46:38 2014, rana, jenne, Update, LSC, Changing PRCL offset changes REFL 165 degeneracy PRC_offsetCheck_24Feb2014.pdf
       Reply  Tue Feb 25 14:48:49 2014, ericq, Update, LSC, Changing PRCL offset changes REFL 165 degeneracy MICHvPRCLangle_wOffset.pdfSBprclPeaks.pdf
          Reply  Tue Feb 25 16:07:33 2014, ericq, Update, LSC, Changing PRCL offset changes REFL 165 degeneracy MICHvPRCLangle_wOffset.pdfMICHvPRCLangle_wOffset_fullscale.pdf
             Reply  Wed Feb 26 01:49:08 2014, Jenne, Update, LSC, Changing PRCL offset changes REFL 165 degeneracy DemodPhaseSeparation.pdfPOP_AS_PDvalues.pdf
Message ID: 9670     Entry time: Tue Feb 25 14:48:49 2014     In reply to: 9669     Reply to this: 9671
Author: ericq 
Type: Update 
Category: LSC 
Subject: Changing PRCL offset changes REFL 165 degeneracy 

After speaking with Jenne and Gabriele, I did a little bit of simulating based on my earlier code that looked at the angle of MICH vs. PRCL, just with cavity detuning instead of macroscopic length change.

The zero point in the following plots is with the PRC locked on the sideband. The PRC detuning was done by changing the PRM-BS microscopic length (in terms of phase), and the MICH detuning was done by adding half of the detuning to the BS-ITMY distance, and subtracting half of it from the BS-ITMX distance. 

MICHvPRCLangle_wOffset.pdf

 

This plot is in terms of radians, so to roughly relate it to line width, here's a plot of the POP powers as a function of the PRC detuning. 

SBprclPeaks.pdf 

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