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Entry  Fri Nov 26 13:00:20 2010, Zach, Laser, GYRO, Gyro OLTFs and current noise spectrum oltfs_11_23_10.pnggnoise_11_23_10.png
    Reply  Fri Nov 26 19:43:34 2010, Koji, Laser, GYRO, Gyro OLTFs and current noise spectrum 
Message ID: 1177     Entry time: Fri Nov 26 13:00:20 2010     Reply to this: 1178
Author: Zach 
Type: Laser 
Category: GYRO 
Subject: Gyro OLTFs and current noise spectrum 

 Here is a plot of the CCW and CW loop OLTFs as measured on Wednesday afternoon. They both have a UGF around 12 kHz with a phase margin of 20 degrees for the CW loop and a lousy ~7 degrees for the CCW loop

oltfs_11_23_10.png

Here is the current noise plot as measured in the AOM feedback signal. The level is about the same as before. The calibration is

500 kHz/V (VCO gain) x (c * 3.15 m) / (4 * 0.62 m2) ~ 0.67 (rad/s)/V

gnoise_11_23_10.png

Now that I have current OLTF models I can continue with the list here

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