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40m Log |
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Mon Jan 23 15:16:52 2017, gautam, Update, Optical Levers, ETMY Oplev HeNe needs to be replaced
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Mon Jan 23 17:24:26 2017, Steve, Update, Optical Levers, ETMY Oplev HeNe is running hot
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Tue Jan 24 17:52:15 2017, Craig, Update, Optical Levers, ETMY Oplev HeNe is replaced 6x
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Wed Mar 1 08:28:04 2017, Steve, Update, Optical Levers, oplev laser RIN 
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Thu Mar 2 13:59:04 2017, Steve, Update, Optical Levers, oplev laser RIN
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Thu Mar 2 17:58:45 2017, rana, Update, Optical Levers, oplev laser RIN
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Fri Mar 3 17:24:21 2017, Steve, Update, Optical Levers, oplev laser RIN
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Wed Mar 8 15:28:37 2017, Steve, Update, Optical Levers, oplev laser RIN 
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Mon Apr 10 09:49:32 2017, Steve, Update, Optical Levers, oplev laser RIN test planning
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Mon Apr 10 14:21:57 2017, rana, Update, Optical Levers, oplev laser RIN test planning
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Tue May 30 13:36:58 2017, Steve, Update, Optical Levers, ETMY Oplev HeNe is replaced
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Tue Jan 15 18:16:00 2019, gautam, Update, Optical Levers, ETMY Oplev HeNe needs replacement 
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Fri Jan 18 12:52:07 2019, gautam, Update, Optical Levers, BS/PRM Oplev HeNe replaced
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Message ID: 12866
Entry time: Fri Mar 3 17:24:21 2017
In reply to: 12864
Reply to this: 12873
12932
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Author: |
Steve |
Type: |
Update |
Category: |
Optical Levers |
Subject: |
oplev laser RIN |
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Corrected oplev laser RIN plot at day 3
RXA:
- to measure RIN, the lever arm should be really short, not long.
- the beam should be 3x smaller than the active area of the diode
- the specular beam should be dumped on a razor dump.
- we need to make a summary page for HeNe laser testing so that we can see 24 hour specgrams of these things for ~3-4 lasers at the same time.
- We should add specgram stuff for the existing HeNe SUM channels on the active OLs.
GV: The channel the PD Steve is using is hooked up to C1:ALS-FC_X_F_IN. As I found out today, there can be considerable RF pickup between the C1:ALS-FC_X_F_IN and C1:ALS-FC_Y_F_IN channels, which share a common 4-pin LEMO cable - this is because the rise time of the square wave output of the Wenzel dividers is <1us, so suitability of this particular channel for the RIN measurement set up has to be reconsidered. Perhaps we can use one of the six spare PEM channels over at 1X6. |
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