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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: 1860     Entry time: Wed Nov 11 12:28:33 2020     In reply to: 1859
Author: Paco 
Type: DailyProgress 
Category: General 
Subject: EP30 softening 

Attempted two methods to soften EP30-2, the results are summarized below.

(a) Heat -- Used the heat gun set to 200 F (~ 93 C) and held it near the back of the part so that the grating surface was never in direct exposure. The airflow was kept constant for a period of ~ 10 min, while I periodically checked to see if there were any signs of bond softening. After no signs of softening, I stopped and moved to method (b).

(b) Solvent -- After brief investigation and referring to T1400711, I got some acetone from CTN, and set up a ~ 50 ml bath. The part was not completely submerged and was arranged such that the grating face was always exposed to air, which I left for ~14 hours. The drawback of this method is that some of the acetone evaporated and at some point the EP30 bond stopped being in contact with the solvent. A picture for reference is attached, with the light blue line indicating the highest acetone level, and the red line indicating the EP30 bond level at the beginning of the bath.

Attachment 1: acetone_bath.jpg  1.201 MB  | Show | Show all
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