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Entry  Fri Sep 21 09:59:09 2018, yuki, Configuration, ASC, Y end table upgrade plan Pic_CurrentSetup_AUXYgreen.jpegModeMatchingSolution_Current.pdfModeMatchingSolution_Current_Magnified.pdfModeMatchingSolution_Optimized.pdfModeMatchingSolution_Optimized_Magnified.pdf
    Reply  Sun Sep 23 19:32:23 2018, yuki, Configuration, ASC, Y end table upgrade plan Pic_NewSetup0923_AUXYgreen.jpegModeMatchingSolution_Result.pdfModeMatchingSolution_Magnified_0923.jpgpic0923_1.jpgpic0923_2.jpg
       Reply  Mon Sep 24 11:09:05 2018, yuki, Configuration, ASC, Y end table upgrade plan pic0924_1.jpg
       Reply  Tue Sep 25 18:08:50 2018, yuki, Configuration, ASC, Y end table upgrade plan 
          Reply  Thu Sep 27 14:02:55 2018, yuki, Configuration, ASC, PZT driver board verification PZTdriverSimulationDiagram.pdfPZTdriverSimulationResult.pdfPZTdriverPerformanceCheck_ResultOUT.pdfPZTdriverPerformanceCheck_ResultMON.pdfPZTdriver.asc
             Reply  Sun Sep 30 20:14:51 2018, yuki, Configuration, ASC, QPD calibration QPDcalibrationXaxis.pdfQPDcalibrationYaxis.pdf
                Reply  Mon Oct 1 12:03:41 2018, not yuki, Configuration, ASC, PZT driver board verification 
                   Reply  Mon Oct 1 13:33:55 2018, yuki, Configuration, ASC, QPD calibration Pic_QPDcalibration.jpg
                      Reply  Tue Oct 2 18:50:53 2018, yuki, Configuration, ASC, PZT mirror calibration PZTM1calibrationCH2.pdfPZTM1calibrationCH1.pdfPZTM2calibrationCH2.pdfPZTM2calibrationCH1.pdf
                         Reply  Wed Oct 3 18:15:34 2018, yuki, Configuration, ASC, AI board improvement TF_AIboard.pdf
                            Reply  Thu Oct 4 00:44:50 2018, yuki, Configuration, ASC, AI board improvement 
                               Reply  Thu Oct 4 22:15:30 2018, yuki, Configuration, ASC, Y-end table upgrade AUXYGreenLock20180921.jpgPic_FormerSetup.jpegPic_CurrentSetup1004.jpg
                                  Reply  Fri Oct 5 00:46:17 2018, Koji, Configuration, ASC, Y-end table upgrade 
                                     Reply  Fri Oct 5 17:32:38 2018, yuki, Configuration, ASC, Y-end table upgrade 
                                        Reply  Mon Oct 8 00:46:35 2018, yuki, Configuration, ASC, Y-end table upgrade 
                                  Reply  Fri Oct 5 17:47:55 2018, gautam, Configuration, ASC, Y-end table upgrade 
                                     Reply  Fri Oct 5 22:49:22 2018, yuki, Configuration, ASC, Y-end table upgrade 
                                        Reply  Sun Oct 7 16:51:03 2018, gautam, Configuration, LSC, Yarm triggering changed 
                                           Reply  Sun Oct 7 22:30:42 2018, yuki, Configuration, LSC, Yarm Green locking was recovered Pic_NewLayout1007.jpgYendGreenModeMatching.zip
                                              Reply  Tue Oct 9 23:03:43 2018, yuki, Configuration, LSC, Yarm Green locking was recovered Pic_1Y4.jpgPic_PZTcable.jpg
                                                 Reply  Wed Oct 10 12:38:27 2018, yuki, Configuration, LSC, All hardware was installed 
          Reply  Mon Oct 1 20:39:09 2018, gautam, Configuration, ASC, c1asy 
             Reply  Mon Oct 8 18:56:52 2018, gautam, Configuration, ASC, c1asx filter coefficient file missing 
             Reply  Tue Oct 9 16:05:29 2018, gautam, Configuration, ASC, c1tst deleted, c1asy deployed. CDSoverview_ASY.png
    Reply  Wed Oct 3 14:24:40 2018, yuki, Configuration, ASC, Y end table upgrade plan 
       Reply  Mon Oct 15 20:11:56 2018, yuki, Configuration, ASC, Y end table upgrade plan 
          Reply  Wed Oct 17 20:46:24 2018, yuki, Configuration, ASC, Y end table upgrade plan 
Message ID: 14221     Entry time: Mon Oct 1 13:33:55 2018     In reply to: 14220     Reply to this: 14224
Author: yuki 
Type: Configuration 
Category: ASC 
Subject: QPD calibration 
Quote:

I assume this QPD set is a D1600079/D1600273 combo.

How much was the SUM output during the measurement? Also how much were the beam radii of this beam (from the error func fittings)?
Then the calibration [V/m] is going to be the linear/inv-linear function of the incident power and the beam radus.

You mean the linear range is +/-50mV (for a given beam), I guess.
  • The SUM output was from -174 to -127 mV.
  • The beam radii calculated from the error func fittings was 0.47 mm.
  • Total optical path length measured by a ruler= 36 cm.
  • Beam power measured at QPD was 2.96 mW. (There are some loss mechanism in the setup.)

Then the calibration factor of the QPD is

X axis: 584 * (POWER / 2.96mW) * (0.472mm /  RADIUS) [mV/mm]
Y axis: 588 * (POWER / 2.96mW) * (0.472mm /  RADIUS) [mV/mm].

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