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Entry  Thu Jun 3 00:52:37 2010, tarac, Laser, Laser, Aligning AOM 97-02848-01r0.pdf
    Reply  Thu Jun 3 08:42:44 2010, Frank, Laser, Laser, Aligning AOM AOM3080-194.JPG
       Reply  Thu Jun 3 14:47:58 2010, Frank, Laser, Laser, Aligning AOM 
          Reply  Thu Jun 3 15:45:39 2010, Frank, Laser, Laser, Aligning AOM 
             Reply  Thu Jun 3 22:00:21 2010, Frank, Laser, Laser, Aligning AOM 
                Reply  Fri Jun 4 00:03:17 2010, Jenne, Computing, Environment, Spam 
                   Reply  Sat Jun 5 16:17:05 2010, Koji, Computing, Environment, Spam 
Message ID: 140     Entry time: Thu Jun 3 00:52:37 2010     Reply to this: 141
Author: tarac 
Type: Laser 
Category: Laser 
Subject: Aligning AOM 

 I'm aligning the AOM and maximizing the diffracted beam's power by positioning the AOM and adjusting the beam size by moving the lens.

For single pass, the maximum efficiency I could get is only ~60%, so for double pass, the power will be down to 36%, but for now I'll settle with this number.

I could not find the manual for Crystal technology AOM 3080-194. The closest one is model 3080-197 which is attached below.

I'm not sure what is the difference between the two model, but 3080-197 has 70% diffraction efficiency.

Because of adjusting the lens, the RefCav's beam path also changes, now I have to realign RefCav again.

 

  Another step for AOM alignment is adjusting the mirror that reflects the transmitted beam back to the AOM again.

The distance between the mirror and the center of the AOM should be the same as ROC of the mirror.

After this I should be able to start locking ACav.

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