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Entry  Fri Feb 12 13:15:41 2010, kiwamu, Update, Electronics, triple resonant EOM --- liniaryity test linearity_edit.png
    Reply  Sat Feb 13 13:21:53 2010, Koji, Update, Electronics, triple resonant EOM --- liniaryity test 
Message ID: 2602     Entry time: Sat Feb 13 13:21:53 2010     In reply to: 2596
Author: Koji 
Type: Update 
Category: Electronics 
Subject: triple resonant EOM --- liniaryity test 

Looks good. I just thought of the idea that we also can use Alberto's PLL setup to sense the modulation with more sensitivity.  ;-)

Quote:

I have measured the linearity of our triple resonant EOM (i.e. modulation depth versus applied voltage)

The attached figure is the measured modulation depth as a function of the applied voltage.

The linear behavior is shown below 4Vrms, this is good.

Then it is  slowly saturated as the applied voltage goes up above 4Vrms.

However for the resonance of 29.5MHz, it is difficult to measure below 7Vrms because of the small modulation depth.

Our triple resonant EOM looks healthy

 - - - - result from fitting - - -

11MHz: 910mrad/Vrms+20mrad

29.5MHz: 46mrad/Vrms+6.2mrad

55MHz:820mrad/Vrms+10mrad

 

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