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40m Log |
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Wed Apr 13 00:56:07 2016, gautam, Update, endtable upgrade, X endtable repopulation
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Wed Apr 13 11:00:28 2016, Steve, Update, endtable upgrade, X endtable repopulation
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Wed Apr 13 18:25:07 2016, gautam, Update, endtable upgrade, Lightwave health check
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Fri Apr 15 18:38:12 2016, gautam, Update, endtable upgrade, Lightwave health check - NO IMPROVEMENT
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Tue Apr 19 18:37:29 2016, gautam, Update, endtable upgrade, Laser swap + optical layout
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Thu Apr 21 14:25:52 2016, gautam, Update, endtable upgrade, Green light recovered  
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Tue Apr 26 15:22:35 2016, Steve, Update, endtable upgrade, Cleaning ETMX vacuum dirty window 
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Tue Apr 26 23:19:42 2016, gautam, Update, endtable upgrade, Green aligned to arm - high order mode flashes seen 
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Thu Apr 28 00:41:08 2016, gautam, Update, endtable upgrade, more progress - Transmon PD installed
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Fri Apr 29 00:55:46 2016, gautam, Update, endtable upgrade, green PDH locked to Xarm
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Mon May 2 19:14:18 2016, gautam, Update, endtable upgrade, Optical layout almost complete
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Thu May 5 03:05:37 2016, gautam, Update, endtable upgrade, ALS status update  
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Thu May 5 04:05:03 2016, ericq, Update, LSC, Aux X PDH checks 
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Thu May 5 14:03:52 2016, ericq, Update, LSC, Further Aux X PDH tweaks
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Thu May 5 14:05:01 2016, rana, Update, endtable upgrade, ALS status update
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Thu May 5 21:28:44 2016, gautam, Update, endtable upgrade, Innolight PZT capacitance
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Thu May 19 16:29:20 2016, Steve, Update, endtable upgrade, Optical layout almost complete 
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Fri Sep 30 19:53:07 2016, gautam, Update, endtable upgrade, X end IR pickoff fiber coupled
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Wed Oct 5 16:28:10 2016, gautam, Update, endtable upgrade, EX laser power monitor PD installed
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Wed Apr 27 15:04:47 2016, Steve, Update, endtable upgrade, Cleaning ETMX vacuum dirty window
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Fri Apr 29 16:05:23 2016, gautam, Update, endtable upgrade, Cleaning ETMX vacuum dirty window
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Message ID: 12106
Entry time: Thu May 5 04:05:03 2016
In reply to: 12105
Reply to this: 12107
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Author: |
ericq |
Type: |
Update |
Category: |
LSC |
Subject: |
Aux X PDH checks |
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We took an OLG measurement of the green PDH loop. It seems consistent with past measurements. I've added a trace for the the post-mixer lowpass, to show its contribution to the phase loss. (EDIT: updated with measured LPF TF)

I used this measured OLG and the datasheet laser PZT conversion factor to calibrate the control signal monitor into the AUX laser frequency noise, it looks consistent with the frequency noise measured via the PSL PLL (300 Hz/rtHz @ 100Hz). Above a few tens of kHz, the control signal measurement is all analyzer noise floor, due to the fourth order 70kHz lowpass after the mixer (the peaks change height significantly depending on the analyzer input range, so I don't think they're on the laser). Gautam will follow up with more detailed measurements of both the error and control signals as he noisebudgets, this was just intended as a quick consistency check.

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