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Entry  Wed Mar 7 16:32:09 2012, keiko, Update, LSC, OSA 
    Reply  Wed Mar 7 19:10:06 2012, kiwamu, Update, LSC, REFL OSA : how the signal look like OSArefl.png
       Reply  Wed Mar 7 20:06:23 2012, Koji, Update, LSC, REFL OSA : how the signal look like 
          Reply  Wed Mar 7 22:04:05 2012, kiwamu, Update, LSC, REFL OSA : how the signal look like 
Message ID: 6378     Entry time: Wed Mar 7 19:10:06 2012     In reply to: 6375     Reply to this: 6379
Author: kiwamu 
Type: Update 
Category: LSC 
Subject: REFL OSA : how the signal look like 

Just a quick report on the REFL OSA.

The attached plot below shows the raw signal from the REFL OSA which Keiko installed in this afternoon.

When the data was taken the beam on the REFL OSA was a direct reflection from PRM with the rest of the suspended mirrors misaligned.

One of the upper and lower 11 MHz sidebands is resolved (it is shown at 0.12 sec in the plot) while the other one is still covered by the carrier tail.

The 55 MHz upper and lower sidebands are well resolved (they are at 0.06 and 0.2 sec in the plot).

One of the oscilloscopes monitoring the OSA signals in the control room has a USB interface so that we can record the data into a USB flash memory and plot it like this.


Quote from #6375

 I swap an OSA at PSL and OSA at REFL. It was because the PSL-OSA had a better resolution, so we place this better one at REFL. The ND filter (ND3) which was on the way to REFL OSA was replaced by two BSs, because it was producing dirty multiple spots after transmitting.


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