40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  PSL  Not logged in ELOG logo
 List  |  Find  |  Login  |  Help 
Entry  Mon Jan 24 21:02:15 2011, tara, DailyProgress, NoiseBudget, RIN coupling to frequency noise vco_tf_fit.png
    Reply  Sat Apr 23 22:15:39 2011, rana, DailyProgress, NoiseBudget, RIN coupling to frequency noise 
       Reply  Mon Apr 25 10:40:00 2011, Frank, DailyProgress, NoiseBudget, RIN coupling to frequency noise 
          Reply  Wed Apr 27 22:09:10 2011, tara, DailyProgress, NoiseBudget, RIN coupling to frequency noise 
             Reply  Sun May 1 22:39:56 2011, tara, DailyProgress, NoiseBudget, RIN coupling to frequency noise TF.pngPSD.png
                Reply  Mon May 2 10:32:58 2011, Frank, DailyProgress, NoiseBudget, RIN coupling to frequency noise 
                   Reply  Tue May 3 11:59:55 2011, tara, DailyProgress, NoiseBudget, RIN coupling to frequency noise 
Message ID: 598     Entry time: Tue May 3 11:59:55 2011     In reply to: 597
Author: tara 
Type: DailyProgress 
Category: NoiseBudget 
Subject: RIN coupling to frequency noise 

The coupling coefficient I measured before changed with input power/ alignment of the beam. What I measured before might be the RF-AM effect. [figures and more details will be added]

 

I read Frank's entry, and tried to see the effect of other parameters on coupling coefficient. I tried

      1) misaligning  the  beam into the cavity, and

        The power level is still 1mW input. I turned the knob of the periscope to misaligned the beam. RCTRANSPD DC value dropped from 250 mV to 207 mV, the peak at 10Hz in FASTMON disappeared. 

      [add fig]

 

 

      2) changing power input to the cavity. I tried 0.5 mW, 1 mW, 2mW, 5mW

 As I changed the power, I adjusted the gain so that the noise from MIXEROUT remained the same, but at certain power I could not see the peak in FASTMON signal.

[add fig]

 

 

 

ELOG V3.1.3-