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Mon Oct 26 19:10:59 2015, gautam, Update, Green Locking, AUX PDH loop characterization
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Tue Dec 8 23:24:08 2015, gautam, Update, Green Locking, Y end laser (Lightwave) PZT calibration
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Sun Dec 13 21:55:28 2015, gautam, Update, Green Locking, Y end laser (Lightwave) PZT calibration   
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Mon Dec 14 16:27:11 2015, gautam, Update, Green Locking, Y-end AUX PDH noise breakdown 
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Mon Jan 4 16:45:11 2016, gautam, Update, Green Locking, Y-end AUX PDH noise breakdown  
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Mon Jan 4 16:09:54 2016, gautam, Update, Green Locking, Y end laser (Lightwave) PZT calibration 
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Message ID: 11906
Entry time: Mon Jan 4 16:09:54 2016
In reply to: 11877
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Author: |
gautam |
Type: |
Update |
Category: |
Green Locking |
Subject: |
Y end laser (Lightwave) PZT calibration |
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Summary:
I redid this measurement and have now determined the actuator gain to be 4.61 +/- 0.10 MHz/V. This is now pretty consistent with the expected value of ~5MHz/V as reported here.
Details:
I made the following changes to the old methodology:
- Instead of integrating around the excitation frequency, I am now just taking the ratio of peak heights (phase tracker output / error signal monitor) to determine the actuator gain.
- I had wrongly assumed that the phase tracker output was calibrated to green Hz and not IR Hz, so I was dividing by two where this was not necessary. I think this explains why my previous measurement yielded an answer approximately half the expected value.
I also took spectra of the phase tracker output and error signal to make sure I was choosing my excitation frequencies in regions where there were no peaks already present (Attachment #1).
The scatter of measured actuator gains at various excitation frequencies is shown in Attachment #2. |
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