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Entry  Mon Jul 18 18:34:29 2022, Paco, General, Design specs, HR coating update ETM_R.pdfITM_R.pdfETM_Layers.pdfITM_Layers.pdf
    Reply  Fri Jul 22 13:36:55 2022, Paco, General, Design specs, HR coating update ETM_corner.pdfITM_corner.pdf
       Reply  Tue Aug 16 09:58:23 2022, Paco, General, Design specs, HR coating update 6x
          Reply  Tue Aug 23 17:10:50 2022, Paco, General, Design specs, New corner plots ITM_corner.pdfETM_corner.pdf
Message ID: 67     Entry time: Mon Jul 18 18:34:29 2022     Reply to this: 68
Author: Paco 
Type: General 
Category: Design specs 
Subject: HR coating update 

I've been running the HR coating optimization for mariner TMs. Relative to the specifications found here we now are aiming for

  • ITM HR coating of 2000 ppm @ 2050.15 nm, and 1000 ppm @ 1550 nm
  • ETM HR coating of 25 ppm @ 2050.15 nm, and 1000 ppm @ 1550 nm.

Both the PSL and AUX cavity finesses range the few couple of thousands, and the goal is not to optimize the coating stack for noise, but more importantly for the transmission values and tolerances. This way we ensure the average finesse and differential finesse requirements are met. Anyways, Attachment #1-2 shows the transmission plots for the optimized coating stacks (so far). Attachments #3-4 show the dielectric stacks. The code still lives in this repository.

I'm on the process of assessing the tolerance of this design stacks against perturbations in the layer thicknesses; to be posted in a follow-up elog.

Attachment 1: ETM_R.pdf  23 kB  Uploaded Mon Jul 18 19:40:29 2022  | Hide | Hide all
Attachment 2: ITM_R.pdf  22 kB  Uploaded Mon Jul 18 19:40:38 2022  | Hide | Hide all
Attachment 3: ETM_Layers.pdf  30 kB  Uploaded Mon Jul 18 19:42:04 2022  | Hide | Hide all
Attachment 4: ITM_Layers.pdf  29 kB  Uploaded Mon Jul 18 19:42:13 2022  | Hide | Hide all
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