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Entry  Mon Nov 9 17:38:18 2020, Paco, DailyProgress, General, SAF gain chip first light 2020_11_09_ldc200c_test.png20201109_aspheric.jpg20201109_firstlight.jpg20201109_grating.jpg
    Reply  Tue Nov 10 00:02:20 2020, Koji, DailyProgress, General, SAF gain chip first light 
       Reply  Tue Nov 10 10:32:57 2020, Paco, DailyProgress, General, SAF gain chip first light 
          Reply  Wed Nov 11 12:28:33 2020, Paco, DailyProgress, General, EP30 softening acetone_bath.jpg
Message ID: 1857     Entry time: Mon Nov 9 17:38:18 2020     Reply to this: 1858
Author: Paco 
Type: DailyProgress 
Category: General 
Subject: SAF gain chip first light 

Entered Crackle ~ 8:47 AM.

Briefly fixed the LDC220C connection to the SAF1900 as described previously, and then installed the aspheric flexture and shoulder to the assembly (pictures below). Then, I used the thermal power meter head borrowed from OMC to check for emission as a function of laser diode current at a fixed temperature of 25 C (to match testing conditions). The result is below, where I seem to be getting slightly better amplified spontaneous emission (ASE) power than the attached test sheet. It may as well be that I am not measuring the ASE power alone, but I cannot presently determine this.

I added the grating and moved the power meter to the correct output aperture, but failed to detect any power. This suggests a wrong grating orientation, although I will try to verify this more carefully.

Attachment 1: 2020_11_09_ldc200c_test.png  61 kB  | Hide | Hide all
Attachment 2: 20201109_aspheric.jpg  2.920 MB  Uploaded Mon Nov 9 19:23:38 2020  | Hide | Hide all
Attachment 3: 20201109_firstlight.jpg  3.395 MB  Uploaded Mon Nov 9 19:23:49 2020  | Hide | Hide all
Attachment 4: 20201109_grating.jpg  3.031 MB  Uploaded Mon Nov 9 19:24:01 2020  | Hide | Hide all
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