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Entry  Tue Sep 18 20:32:42 2012, Manasa, Configuration, PSL, AOM installation 
    Reply  Wed Sep 19 11:39:37 2012, Manasa, Configuration, PSL, AOM installation ALC_25.png
       Reply  Wed Sep 19 15:41:27 2012, Manasa, Configuration, PSL, AOM installation 
          Reply  Wed Sep 19 23:17:25 2012, rana, Configuration, PSL, AOM installation 
             Reply  Thu Sep 20 01:29:04 2012, Manasa, Configuration, PSL, AOM installation TEK00000.PNG
                Reply  Fri Sep 21 12:12:56 2012, Manasa, Configuration, PSL, AOM installation PSL.png
                   Reply  Tue Oct 2 16:15:22 2012, Manasa, Configuration, PSL, AOM installation psl_aom.png
                      Reply  Wed Oct 3 16:52:16 2012, Manasa, Configuration, PSL, AOM installation 
                         Reply  Wed Oct 3 23:36:54 2012, Koji, Configuration, PSL, AOM installation PMCTRANS.png
                            Reply  Thu Oct 4 17:54:59 2012, Manasa, Configuration, PSL, AOM installation 
                               Reply  Thu Oct 4 18:48:04 2012, janosch, Configuration, PSL, AOM installation 
                                  Reply  Thu Oct 4 20:57:43 2012, Manasa, Configuration, PSL, AOM installation 
                                     Reply  Thu Oct 4 22:16:28 2012, Koji, Configuration, PSL, AOM installation 
                                        Reply  Fri Oct 5 18:08:17 2012, Manasa, Configuration, PSL, AOM installation 
Message ID: 7471     Entry time: Wed Oct 3 16:52:16 2012     In reply to: 7464     Reply to this: 7474
Author: Manasa 
Type: Configuration 
Category: PSL 
Subject: AOM installation 

{Jan, Manasa}

We set start to check the performance of the AOM on the PSL table. The AOM driver spits out ~1.5W rf at 80MHz for 1V DC at its modulation input. In order to align the AOM, we reduced the input power to the AOM to ~10% using the QWP between the PBS and the laser. We touched the steering mirror before the AOM...but did not succeed in getting any appreciable first order deflection. We then released the AOM mount and moved it a few microns in and out until we obtained a significant change in power along the zero-order beam from 400mV to 100mV when the rf power was changed from 0 to ~1.5W (by changing modulation input from 0 to 1V).  The AOM was clamped at this alignment and the QWP was rotated to give maximum input power. 

During the course of aligning the AOM, the PMC unlocked and was restored after the alignment. 

All went well without having to make any emergency calls to anyone

We will now have to think about switching the AOM on and off for ringdown measurements. This could be done by either using a high-power rf switch or by switching the modulation DC input between 0 and 1V; whichever will be more comfortable to take many many ringdown measurements.

 

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