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Entry  Wed Mar 27 21:53:21 2013, Annalisa, Update, ABSL, Beat note of ATF auxiliary laser 
    Reply  Thu Mar 28 23:00:30 2013, Annalisa, Update, ABSL, Beat note of ATF auxiliary laser found 
Message ID: 8369     Entry time: Thu Mar 28 23:00:30 2013     In reply to: 8361
Author: Annalisa 
Type: Update 
Category: ABSL 
Subject: Beat note of ATF auxiliary laser found 

 

The beat note for the ATF lab laser has been found. 

The measurement has been carried out in the same way as described in elog 8368.

The only difference is that in this case I started from a temperature of 35.2 degC, and I reduced it until the minimum which was 30.71 degC. No beat note in this range.

Then I rised on the temperature and I found the first beat note at 41.46 degC. It has been detected at a frequency of about 120 MHz with an RF power of -53 dBm and a frequency fluctuation of about  +/- 5 MHz. 

I tried to improve the alignment to have a stronger beat, but it was the maximum I could reach. Maybe I could increase the power hitting the photodiode, which was 0.453 mW. 

 

 

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