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Entry  Wed Jan 17 23:36:12 2018, johannes, Configuration, General, AS port laser injection PSLbeat.svg.pngASpath.svg.png
    Reply  Wed Apr 18 22:46:23 2018, johannes, Configuration, General, AS port laser injection ASpath.svg.pngpower_out_fluctuation_DC.pngpower_out_fluctuation_AC_zoom.png
       Reply  Thu Apr 19 01:04:00 2018, gautam, Configuration, General, AS port laser injection 
          Reply  Thu Apr 19 20:41:09 2018, Koji, Configuration, General, Aux Laser LD dying? (AS port laser injection) Aux_laser_adj_Pout.pdfAux_laser_RIN.pdf
             Reply  Tue Apr 24 08:36:47 2018, johannes, Configuration, General, Aux Laser LD dying? (AS port laser injection) 
       Reply  Thu May 3 10:40:43 2018, johannes, Configuration, General, AS port laser injection mm_solution_AStable.pngAStable_beampath.pdf
          Reply  Thu May 3 12:10:12 2018, gautam, Configuration, General, AS port laser injection 
          Reply  Wed May 23 00:45:18 2018, johannes, Configuration, General, AS port laser injection faraday_location.pdf
Message ID: 13772     Entry time: Thu Apr 19 20:41:09 2018     In reply to: 13766     Reply to this: 13781
Author: Koji 
Type: Configuration 
Category: General 
Subject: Aux Laser LD dying? (AS port laser injection) 

I suspect that the LD of the aux laser is dying.
- The max power we obtain from this laser (700mW NPRO) is 33mW. Yes, 33mW. (See attachment 1)
- The intensity noise is likely to be relaxation oscillation and the frequency is so low as the pump power is low. When the ADJ is adjusted to 0, the peak moved even lower. (Attachment 2, compare purple and red)
- What the NE (noise eater) doing? Almost nothing. I suspect the ISS gain is too low because of the low output power. (Attachment 2, compare green and red)

Attachment 1: Aux_laser_adj_Pout.pdf  452 kB  Uploaded Thu Apr 19 21:42:23 2018  | Hide | Hide all
Aux_laser_adj_Pout.pdf
Attachment 2: Aux_laser_RIN.pdf  846 kB  Uploaded Thu Apr 19 21:42:23 2018  | Hide | Hide all
Aux_laser_RIN.pdf
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