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40m
QIL
Cryo_Lab
CTN
SUS_Lab
TCS_Lab
OMC_Lab
CRIME_Lab
FEA
ENG_Labs
OptContFac
Mariner
WBEEShop
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| 40m Log |
Not logged in |
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 Thu Jan 4 12:46:27 2018, gautam, Update, ALS, Fiber ALS assay 
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 Thu Jan 11 14:22:40 2018, gautam, Update, ALS, Fiber ALS assay
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Thu Jan 11 20:51:20 2018, gautam, Update, ALS, Fiber ALS assay
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Tue Jan 16 21:50:53 2018, gautam, Update, ALS, Fiber ALS assay
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Thu Jan 18 00:35:00 2018, gautam, Update, ALS, Fiber ALS assay
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Fri Jan 19 11:34:21 2018, gautam, Update, ALS, Fiber ALS assay
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Fri Jan 19 23:04:11 2018, gautam, Update, ALS, Fiber ALS assay
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Wed Jan 24 00:33:31 2018, gautam, Update, ALS, Fiber ALS assay
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Wed Jan 24 10:45:14 2018, gautam, Update, ALS, Fiber ALS assay
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Thu Jan 25 23:59:14 2018, gautam, Update, ALS, Fiber ALS assay
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Fri Jan 26 20:03:09 2018, gautam, Update, ALS, Fiber ALS assay
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Wed Jan 31 15:45:22 2018, gautam, Update, ALS, Fiber ALS assay
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Wed Jan 31 16:29:42 2018, gautam, Update, ALS, Modulation depths
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Wed Jan 31 16:33:53 2018, gautam, Update, ALS, ALS electronics at LSC rack
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Wed Jan 31 22:32:11 2018, gautam, Update, ALS, ALS signal chain + power budget
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Thu Feb 1 01:24:56 2018, gautam, Update, ALS, D0902745 revamp underway
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Fri Feb 2 00:26:34 2018, gautam, Update, ALS, D0902745 revamp underway
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Fri Feb 2 13:16:55 2018, gautam, Update, ALS, ALS signals whitening switching
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Mon Feb 5 14:11:01 2018, gautam, Update, ALS, Huge harmonics in ALS channels
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Mon Feb 5 22:57:28 2018, gautam, Update, ALS, Huge harmonics in ALS channels
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Tue Feb 6 11:13:26 2018, gautam, Update, ALS, Possible source of ground loop identified
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Tue Feb 6 22:55:51 2018, gautam, Update, ALS, Possible source of ground loop identified
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Thu Feb 8 00:33:20 2018, gautam, Update, ALS, D990694 characterization / THD measurement plan
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Thu Feb 8 01:27:16 2018, Koji, Update, ALS, D990694 characterization / THD measurement plan
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Fri Feb 9 13:37:44 2018, gautam, Update, ALS, THD measurement trial
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Thu Feb 8 12:00:09 2018, gautam, Update, ALS, D990694 is NOT differential receiving
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Thu Feb 8 13:13:14 2018, gautam, Update, ALS, D990694 pulled out
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Thu Feb 8 18:10:36 2018, gautam, Update, ALS, D990694 pulled out
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Wed Feb 7 15:51:15 2018, gautam, Update, ALS, D0902745 revamp complete
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Fri Feb 16 01:34:40 2018, gautam, Update, ALS, D0902745 in-situ testing
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Tue Feb 20 23:08:27 2018, gautam, Update, ALS, D0902745 in-situ testing
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Thu Feb 22 00:09:11 2018, gautam, Update, ALS, D0902745 in-situ testing
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Sun Feb 25 00:03:12 2018, gautam, Update, ALS, Daughter board prototyping
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Mon Feb 26 20:55:56 2018, rana, Update, ALS, Daughter board prototyping
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Tue Feb 27 21:10:45 2018, gautam, Update, ALS, Daughter board testing
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Wed Feb 28 19:13:25 2018, gautam, Update, ALS, ADC test for differential receiving in c1lsc
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Fri Mar 2 01:45:06 2018, gautam, Update, ALS, new look ALS electronics
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Mon Mar 5 17:27:34 2018, gautam, Update, ALS, new look ALS electronics - characterization
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Thu Mar 8 00:40:25 2018, gautam, Update, ALS, new look ALS electronics - characterization
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Thu Mar 8 19:38:37 2018, gautam, Update, ALS, digital unwhitening of daughter board
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Thu Mar 8 23:50:27 2018, gautam, Update, ALS, First look at new ALS electronics
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Fri Mar 9 01:07:01 2018, gautam, Update, ALS, First look at new ALS electronics
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Mon Mar 12 22:08:31 2018, gautam, Update, ALS, Noisy POX
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Mon Mar 12 23:57:31 2018, gautam, Update, ALS, Noisy POX
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Mon Mar 19 15:02:29 2018, gautam, Update, ALS, Noisy MC sensing
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Thu Feb 1 15:31:12 2018, gautam, Update, ALS, ALS signal chain + power budget
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Wed Feb 7 10:16:26 2018, gautam, Update, ALS, ALS signal chain + power budget
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Thu Jan 25 13:18:41 2018, gautam, Update, ALS, Fiber ALS assay
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Message ID: 13571
Entry time: Wed Jan 24 00:33:31 2018
In reply to: 13562
Reply to this: 13574
13586
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| Author: |
gautam |
| Type: |
Update |
| Category: |
ALS |
| Subject: |
Fiber ALS assay |
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I did some work on the PSL table today. Main motivations were to get a pickoff for the BeatMouth PSL beam before any RF modulations are imposed on it, and to improve the mode-matching into the fiber. Currently, we use the IR light reflected by the post doubling oven harmonic separator. This has the PMC modulation sideband on it, and also some green leakage.
So I picked off ~8.5mW of PSL light from the first PBS (pre Faraday rotator), out of the ~40 mW available here, using a BS-80-1064-S. I dumped the 80% reflected light into the large beam dump that was previously being used to dump this PBS reflection. Initially, I used a R=10% BS for S-pol that I found on the SP table, but Koji tipped me off on the fact that these produce multiple reflected beams, so I changed strategy to use the R=80% BS instead.
The transmitted 20% is routed to the West edge of the PSL table via 2 1" Y1-1037-45S optics, towards the rough vicinity of the fiber coupler. For now it is just dumped, tomorrow I will work on the mode matching. We may want to cut the power further - ideally, we want ~2.5mW of power in the fiber - this is then divided by 4 inside the beat mouth before reaching the beat PD, and with other losses, I expect ~500mW of PSL power and comparable AUX light, we will have a strong >0dBm beat.
Attachment #1 is a picture of my modifications. For this work, I
- Closed PSL shutter, turned HEPA up
- Moved HP GHz spec analyzer to the side for ease of access to the table.
- Moved several optics that look to me as to have once been part of the RefCav setup - I don't think this would have been a useful alignment reference in any case as we moved the RefCav in a non-deterministic way for the PSL secondary shelf install.
- Used one 1" 45 deg S-pol optic from the optics cabinet - remaining optics were scavenged from PSL table and SP table.
- Removed an SMA cable connected to an EOM, whose other end wasn't connected to anything.
- Turned HEPA back down, IMC locks fine now.
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