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Message ID: 176     Entry time: Fri Jun 25 18:27:59 2010
Author: tarac 
Type: Laser 
Category: Laser 
Subject: mode matching to ACav 

  The new driver for AOM is working, the maximum power is ~1.3w. There's a switch for int/ext signal.

We use internal signal to drive the AOM for alignment purpose.

The mode matching for ACav is on hold. Because the1st order beam coming out of the AOM looks very elliptic.

I'm not sure if it's the result of the large beam size in the AOM or the alignment problem.

the beam might clip on the edge of AOM, the beamsize is quite large, the data sheet give 80% 1st order efficiency for 1100 um diameter spot [AOM] and I adjusted the beam size to maximize the power before. I'll try decrease the beam size and see if this reduce the elliptical shape of the beam. Once the beam size on the AOM is determined, the rest of the mode matching can be calculated.


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