40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  PSL  Not logged in ELOG logo
Entry  Mon Dec 20 19:55:11 2010, tara, DailyProgress, optic, rearraging optics for beat measurement 
    Reply  Thu Dec 23 22:41:28 2010, tara, DailyProgress, optic, rearraging optics for beat measurement 
       Reply  Sun Dec 26 02:42:47 2010, tara, DailyProgress, optic, rearraging optics for beat measurement 
          Reply  Mon Dec 27 02:51:33 2010, tara, DailyProgress, optic, rearraging optics for beat measurement beat_2010_12_27.png
Message ID: 442     Entry time: Mon Dec 27 02:51:33 2010     In reply to: 441
Author: tara 
Type: DailyProgress 
Category: optic 
Subject: rearraging optics for beat measurement 

I measured the beat noise after I realigned all optics behind the cavities. The power has not been reduced to 1 mW yet.

This is just a quick measurement to see where we stand (red curve). The noise gets worse compared to the best measurement (green) before the optics behind the

cavities are rearranged, but the mechanical peaks around 1kHz are suppressed significantly.

Attachment 1: beat_2010_12_27.png  47 kB  | Hide | Hide all
beat_2010_12_27.png
ELOG V3.1.3-