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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: 2683     Entry time: Fri Oct 22 09:20:13 2021     In reply to: 2682
Author: Aidan 
Type: Laser 
Category: 2um Photodiodes 
Subject: Improved measurement of QE on photodiodes ~89% at 140K 

Some of the data recorded during the current/micrometer scanning yesterday.

  • Distance between fiber/lens housings = Micrometer + 22.9mm
  • QE = Response / (1000Ohm*9.3E-4W/V) *(h*c/[e*L]) = Response * 0.667

Highlighted change to 25mA and also highest QE.

Time Temperature (K) Laser current (mA) Micrometer (mm) Peak Response (JPL/REF) QE
2:07PM 131.4 30 9.10 1.070 71.0%
2:14PM 133.5 30 9.10 1.090 73.0%
2:20PM 134.8 30 9.00 1.100 75.0%
2:25PM 136.4 30 8.80 1.134 75.6%
2:29PM 137.6 30 8.70 1.140 76.0%
2:31PM 138.1 30 8.60 1.120 74.7%
2:35PM 138.8 25 8.60 1.288 85.9%
2:42PM 140.5 25 8.80 1.246 83.1%
2:45PM   25 8.60 1.285 85.7%
2:249PM 142.2 25 8.40 1.310 87.4%
2:53PM 143 25 8.20 1.322 88.0%
3:01PM 144 25 8.00 1.328 88.6%
3:10PM   25 8.00 1.334 89.0%
3:14PM 147.5 25 7.80 1.314 87.6%
3:16PM 148.05 25 7.60 1.316 87.8%
3:19PM   25 8.00 1.328 88.6%
3:23PM 149.3 25 8.00 1.320 88.0%
3:30PM 151 25 8.00 1.315 87.7%
3:47PM 154 25 8.00 1.315 87.7%
4:02PM 157 25 8.00 1.300 86.7%
4:14PM 159.6 25 8.00 1.305 87.0%
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