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40m Log |
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Mon Mar 6 12:34:30 2017, johannes, Summary, ASS, ASS light injection scenarios
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Mon Aug 21 20:11:25 2017, johannes, Summary, General, Loss measurements plan
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Mon Aug 21 21:26:41 2017, gautam, Summary, General, Loss measurements plan
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Tue Aug 22 16:56:54 2017, johannes, Summary, General, AS laser existing components inventory
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Mon Aug 28 23:22:56 2017, johannes, Update, PSL, PSL table auxiliary NPRO   
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Tue Aug 29 20:04:09 2017, rana, Update, PSL, PSL table auxiliary NPRO
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Tue Aug 29 21:36:59 2017, johannes, Update, PSL, PSL table auxiliary NPRO 
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Tue Sep 5 23:13:44 2017, johannes, Update, PSL, PSL table auxiliary NPRO 
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Thu Sep 7 23:09:00 2017, johannes, Update, PSL, PSL table auxiliary NPRO 
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Mon Sep 11 12:40:32 2017, johannes, Update, PSL, PSL table auxiliary NPRO 
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Message ID: 13271
Entry time: Tue Aug 29 21:36:59 2017
In reply to: 13270
Reply to this: 13298
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Author: |
johannes |
Type: |
Update |
Category: |
PSL |
Subject: |
PSL table auxiliary NPRO |
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Quote: |
there is a large (~1 cm) aperture Pockels cell that Frank Siefert was using for making pulses to damage photo diodes. There is a DEI Pulser unit near the entrance to the QIL in Bridge which can drive it.
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I'll look for it tomorrow, but I haven't given up on the AOMs yet. I swapped in the ISOMET modulator today and saw the same behavior, both in 0th and 1st order. The fall time is pretty much identical. Gautam saw no such thing in the PSL AOM using the same photodetector.
1st order diffracted 0th order

In the meantime I prepared the fiber mode-matching but realized in the process that I had mixed up some lenses. As a result the beam did not have a waist at the AOM location and thus didn't have the intended size, although I doubt that this would cause the slower decay. I'll fix it tomorrow, along with setting up the fiber injection, beat note with the PSL, and routing the fiber if possible. |