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Message ID: 15334     Entry time: Fri May 15 09:18:04 2020
Author: Jon 
Type: Update 
Category: BHD 
Subject: BHD telescope designs accounting for ASC 

Hang and I have reanalyzed the BHD telescope designs, with the goal of identifying sufficiently non-degenerate locations for ASC actuation. Given the limited room to reposition optics and the requirement to remain insensitive to small positioning errors, we conclude it is not possible put sufficient Gouy phase separation between the AS1/AS2 and LO1/LO2 locations. However, we can make the current layout work if we instead actuate AS1/AS4 and LO1/LO4. This would require actuating one optic on the breadboard for each relay path. If possible, we believe this offers the simplest solution (i.e., least modification to the current layout).

LO Telescope Design (Attachment 1)

Radius of curvatures:

  • LO1: +10 m
  • LO2: flat
  • LO3: +15 m
  • LO4: flat

AS Telescope Design (Attachment 2)

Radius of curvatures:

  • AS1: +3 m
  • AS2: flat
  • AS3: -1 m
  • AS4: flat
Attachment 1: LOpath.pdf  24 kB  Uploaded Fri May 15 10:33:03 2020  | Show | Show all
Attachment 2: ASpath.pdf  17 kB  Uploaded Fri May 15 10:33:18 2020  | Show | Show all
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