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40m Log |
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Wed Nov 18 22:49:06 2020, gautam, Update, ASC, Some thoughts about AS WFS electronics
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Sun Nov 22 21:09:37 2020, gautam, Update, ASC, Planned mods for WFS head  
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Wed Nov 25 18:18:41 2020, gautam, Update, ASC, Planned mods for WFS head 
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Sat Nov 28 21:44:53 2020, rana, Update, ASC, Planned mods for WFS head
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Thu Dec 10 22:46:57 2020, gautam, Update, ASC, WFS head assembled 
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Thu Dec 17 15:23:56 2020, gautam, Update, ASC, WFS head characterization    
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Wed Nov 25 18:30:23 2020, gautam, Update, ASC, Some thoughts about AS WFS electronics
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Wed Dec 2 23:07:19 2020, gautam, Update, ASC, Electrical LO signal for AS WFS
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Thu Dec 3 11:02:35 2020, rana, Update, Electronics, Electrical LO signal for AS WFS
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Thu Dec 3 13:55:52 2020, Koji, Update, ASC, Electrical LO signal for AS WFS
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Thu Dec 3 20:38:46 2020, gautam, Update, ASC, Electrical LO signal for AS WFS  
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Thu Dec 3 21:14:38 2020, Koji, Update, ASC, Electrical LO signal for AS WFS
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Thu Dec 3 21:44:49 2020, gautam, Update, ASC, Electrical LO signal for AS WFS
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Fri Dec 4 03:02:40 2020, Koji, Update, ASC, Electrical LO signal for AS WFS
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Fri Dec 4 22:41:56 2020, gautam, Update, ASC, Freq Gen Box revamp
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Sat Dec 5 20:44:35 2020, gautam, Update, ASC, Freq Gen Box re-installed 6x
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Mon Dec 7 12:38:51 2020, gautam, Update, IOO, IMC loop char  
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Mon Dec 7 22:54:30 2020, gautam, Update, LSC, Modulation depth measurement
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Sat Jan 16 18:59:44 2021, gautam, Update, LSC, Modulation depth measurement   
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Message ID: 15715
Entry time: Mon Dec 7 22:54:30 2020
In reply to: 15711
Reply to this: 15769
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Author: |
gautam |
Type: |
Update |
Category: |
LSC |
Subject: |
Modulation depth measurement |
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Summary:
I measured the modulation depth at 11 MHz andf 55 MHz using an optical beat + PLL setup. Both numbers are ~0.2 rad, which is consistent with previous numbers. More careful analysis forthcoming, but I think this supports my claim that the optical gain for the PDH locking loops should not have decreased.
Details:
- For this measurement, I closed the PSL shutter between ~4pm and ~9pm local time.
- The photodiode used was the NF1611, which I assumed has a flat response in the 1-200 MHz band, and so did not apply any correction/calibration.
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