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Entry  Fri Jul 22 20:51:13 2011, frank, tara, DailyProgress, optic, cleaning opto mechanical parts IMG_1862.JPGIMG_1863.JPG
    Reply  Tue Jul 26 18:42:16 2011, raphael, tara, DailyProgress, optic, cleaning opto mechanical parts IMG_1866.JPGIMG_1867.JPG
       Reply  Thu Jul 28 01:54:21 2011, frank, tara, DailyProgress, optic, cleaning opto mechanical parts 2011_07_28.pngIMG_1869.JPGIMG_1874.JPGIMG_1875.JPG
          Reply  Fri Jul 29 00:42:19 2011, frank, tara, DailyProgress, optic, cleaning opto mechanical parts IMG_1880.JPGIMG_1883.JPGIMG_1889.JPGIMG_1886.JPGIMG_1878.JPG
             Reply  Tue Aug 2 23:58:40 2011, tara, DailyProgress, optic, New RCAV setup is locked IMG_1911.JPGrcav_2011_08_02.jpg
                Reply  Tue Aug 9 00:39:30 2011, tara, DailyProgress, optic, RCAV modematching optimized 
                   Reply  Mon Aug 15 23:13:53 2011, tara, DailyProgress, optic, RCAV modematching optimized 2011_08_15.png
                      Reply  Wed Aug 17 20:41:13 2011, tara, DailyProgress, optic, ACAV path is up layout_2011_08_17.jpg
Message ID: 647     Entry time: Fri Jul 29 00:42:19 2011     In reply to: 644     Reply to this: 648
Author: frank, tara 
Type: DailyProgress 
Category: optic 
Subject: cleaning opto mechanical parts 

 We preparing optics for the new layout. To reduce scattering noise, most of the Y1-1064 mirrors we have been using will be replaced by super polished mirrors. 

 

We think Y1-1064 mirrors can cause scattering noise in the setup because the coating surfaces look very milky.

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fig1: Y1-1064 mirror.

     We have ~ 10-20 super polished mirrors. Some of them are good, some of them are rejected from the site. The good one will be used for periscope/ beat setup.  I tested a couples of the rejected mirrors, but they can reflect both p and s beams with high efficiency. We will ask Peter to find out what is wrong with them.

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fig2: Left and right, super polished mirror.

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fig3: left, mirrors' case, right, certificate.

 

    I have cleaned about half of the required optics, I think we should be able to lock the first cavity before next Wednesday.

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