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Tue Jul 14 00:57:11 2009, Alberto, Update, Locking, photodiode alignment check
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Wed Jul 15 12:14:08 2009, Alberto, Update, Locking, photodiode alignment check
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Thu Jul 16 01:00:56 2009, Alberto, Update, Locking, PD9 aligned
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Message ID: 1742
Entry time: Tue Jul 14 00:57:11 2009
Reply to this: 1749
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Author: |
Alberto |
Type: |
Update |
Category: |
Locking |
Subject: |
photodiode alignment check |
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Since lately the alignment of the input beam to the interferometer has changed, I went checking the alignment of the beam on the photodiodea. They were all fine except for pd9, that is AS DD 199. Here the DC is totally null. The beam seems to go right on the diode but the scope on the PD's DC output shows no power. This is really strange and bad. |