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Entry  Thu Oct 21 15:32:32 2021, Aidan, Radhika, Laser, 2um Photodiodes, Improved measurement of QE on photodiodes ~89% at 140K IMG_5305.jpg
    Reply  Thu Oct 21 16:52:26 2021, rana, Laser, 2um Photodiodes, Improved measurement of QE on photodiodes ~89% at 140K 
       Reply  Thu Oct 21 17:48:33 2021, Aidan, Laser, 2um Photodiodes, Improved measurement of QE on photodiodes ~89% at 140K 
          Reply  Fri Oct 22 09:20:13 2021, Aidan, Laser, 2um Photodiodes, Improved measurement of QE on photodiodes ~89% at 140K 
          Reply  Fri Oct 22 12:04:13 2021, rana, Laser, 2um Photodiodes, Improved measurement of QE on photodiodes ~89% at 140K 
             Reply  Fri Oct 22 13:31:36 2021, Chris, Laser, 2um Photodiodes, Improved measurement of QE on photodiodes ~89% at 140K 
Message ID: 2682     Entry time: Thu Oct 21 17:48:33 2021     In reply to: 2681     Reply to this: 2683   2684
Author: Aidan 
Type: Laser 
Category: 2um Photodiodes 
Subject: Improved measurement of QE on photodiodes ~89% at 140K 

Definitely. I think the lack of beam profiling/imaging equipment is something we want to address too. We will waste a lot of time in Mariner if we can't profile our beams.

Quote:

its worth looking into how fiber optic mode cleaning actually works:

https://doi.org/10.1201/9780203739662

In order to get a lot of cleaning you have to have a clean beam to begin with. There's a way to pre-clean by putting the laser output into a pinhole before coupling int othe single-mode fiber. Also, use a ~40-50m fiber to make sure the mod-mistanatched beam actually goes into the cladding rather than recombine into the Gaussian beam.

 

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