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 Thu Jul 3 18:48:09 2008, Alberto, Update, General, Beats of the two lasers in the absolute length measurement observed
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 Thu Jul 3 22:54:45 2008, Koji, Update, General, Beats of the two lasers in the absolute length measurement observed
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Mon Jul 7 11:22:02 2008, Alberto, Update, General, Beats of the two lasers in the absolute length measurement observed
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Mon Jul 7 13:06:38 2008, Koji, Update, General, Beats of the two lasers in the absolute length measurement observed
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Message ID: 634
Entry time: Thu Jul 3 18:48:09 2008
Reply to this: 635
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| Author: |
Alberto |
| Type: |
Update |
| Category: |
General |
| Subject: |
Beats of the two lasers in the absolute length measurement observed |
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| I adjusted the alignment of the flipper mirror as suggested by Koji making the two beam spots match. I also aligned all the IFO mirrors (ITMs, PRM, SRM, ETMs) to have more power for the IFO signal at the AS port. When I did that I could see the beats at the AS OSA. Then I explored the range of temperature of the NPRO from 35deg (C) to 51.2807deg and at that point I could observe a peak corresponding to the beat at about 10MHz on the network analyzer. The peak tends to drift because the laser takes probably a longer time to actually thermalize and it moves very rapidly changing the temperature of the laser. |