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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: 14402
Entry time: Tue Jan 15 18:16:00 2019
In reply to: 13018
Reply to this: 14404
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| Author: |
gautam |
| Type: |
Update |
| Category: |
Optical Levers |
| Subject: |
ETMY Oplev HeNe needs replacement |
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Perhaps the ETMY Oplev HeNe is also giving up - the power has fallen by ~30% over 1 year (Attachment #2), nearly twice as much as ETMX but the RIN spectrum (Attachment #1, didn't even need to rotate it!) certainly seems suspicious. Some "nominal" RIN levels for HeNes can be found earlier in this thread. I can't close any of the EY Oplev loops in this condition. I'll double check to make sure I'm routing the right beam onto the QPD, but if the problem persists, I'll replace the HeNe. ITMX HeNe also looks to be near EOL.
| Quote: |
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Finally I reallized what is killing the ETMY oplev laser. Wrong power supply, it was driving the HeNe laser by 600V higher voltage than recommended. Power supply 101T-2300Vdc replaced by 101T-1700Vdc ( Uniphase model 1201-1, sn 2712420 )
The laser head 1103P, sn P947049 lived for 120 days and it was replaced by sn P964431 New laser output 2.8 mW, quadrant sum 19,750 counts
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