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Entry  Wed Jun 26 00:15:51 2013, Annalisa, Update, Green Locking, ETMY - green locking and beat note setup 
    Reply  Thu Jun 27 17:41:08 2013, Annalisa, Update, Green Locking, ETMY -beat note found! beat_note.JPG
Message ID: 8751     Entry time: Wed Jun 26 00:15:51 2013     Reply to this: 8768
Author: Annalisa 
Type: Update 
Category: Green Locking 
Subject: ETMY - green locking and beat note setup 

[Koji, Annalisa]

Alignment improving

  • The alignment of the green beam injected into the Yarm has been improved, and when the green laser is locked on the cavity in 00 mode we moved from 500 cnts to almost  650 cnts in transmission on the PSL table. Now we have about 70 uW transmitted.
  • Since the beam size on the GRTY PD was too big, I put a lens to focus it better.

Beat note setup

  • The Ybeat RFmon was connected back to the power splitter that Yuta put and Manasa temporarily removed (as described in elog 8666), so that now we are using again the SUM port to monitor the beat signal.


  • Align better the beams on the BeatPD, in order to get a stronger beat note
  • Calibrate the ALS screen to tune remotely the laser temperature
  • Find the beat note!



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