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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: 13766     Entry time: Thu Apr 19 01:04:00 2018     In reply to: 13764     Reply to this: 13772
Author: gautam 
Type: Configuration 
Category: General 
Subject: AS port laser injection 

For the arm cavity ringdowns, I guess we don't need AS55/AS110 (although I think the camera will still be useful for alignment). But for something like RC Gouy phase characterization, I'd imagine we need the AS detectors to lock various cavities. So I think we should go for a solution that doesn't disturb the AS PD beams. 

It's hard to tell from the plot in the manual (pg 52) what exactly the relaxation oscillation frequency is, but I think it's closer to 600 kHz (is this characteristic of NdYAG NPROs)??  Is the high RIN on the light straight out of the NPRO? 

Quote:

We could use a simple mirror if we don't need AS110 and AS55, we could use a polarizing BS and work with s polarization, or we find a Faraday Isolator.

There is a strong oscillation around 210 kHz. The oscillation frequency decreases when the output power is turned down, the noise eater has no effect. 
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