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 Sat May 9 00:15:21 2009, Yoichi, Update, PSL, Laser head temperature oscillation 
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 Sat May 9 02:20:11 2009, Jenne, Update, PSL, Laser head temperature oscillation
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Sat May 9 15:19:10 2009, rana, Update, PSL, Laser head temperature oscillation
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Mon May 11 11:49:20 2009, steve, Update, PSL, MOPA cooling water lines are backwards
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Thu May 21 18:07:32 2009, rana, Update, PSL, Screw on Needle valve loosened
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Message ID: 1573
Entry time: Mon May 11 11:49:20 2009
In reply to: 1570
Reply to this: 1617
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| Author: |
steve |
| Type: |
Update |
| Category: |
PSL |
| Subject: |
MOPA cooling water lines are backwards |
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| Quote: | This is 8 days of 10-minute trend.
DTEC is just the feedback control signal required to keep the NPRO's pump diode at a constant temperature.
Its not the amplifier or the actual NPRO crystal's temperature readout.
There is no TEC for the amplifier. It looks like to me that by opening up the flow to the NPRO some more
we have reduced the flow to the amplifier (which is the one that needs it) and created these temperature
fluctuations.
What we need to do is choke down the needle valve and ream out the NPRO block. |
I have measured the "input" line temp at the MOPA box 10 C and the "out" line 8 C
This must be corrected.
However look at the 80 days plot of operation where the head temp variation is nothing new |
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