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This content will become publicly available on December 11, 2018

Title: Methods for improving the damage performance of fused silica polished by magnetorheological finishing

The laser-induced damage threshold of fused-silica samples processed via magnetorheological finishing is investigated for polishing compounds depending on the type of abrasive material and the post-polishing surface roughness. The effectiveness of laser conditioning is examined using a ramped pre-exposure with the same 351-nm, 3-ns Gaussian pulses. Lastly, we examine chemical etching of the surface and correlate the resulting damage threshold to the etching protocol. A combination of etching and laser conditioning is found to improve the damage threshold by a factor of ~3, while maintaining <1-nm surface roughness.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [1]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  2. QED Technologies, Rochester, NY (United States)
Publication Date:
Report Number(s):
2017-97; 13-81
Journal ID: ISSN 0277-786X; 2017-97, 1381, 2338
Grant/Contract Number:
NA0001944
Type:
Accepted Manuscript
Journal Name:
Proceedings of SPIE - The International Society for Optical Engineering
Additional Journal Information:
Journal Volume: 10447; Conference: 49. Annual Symposium on Optical Materials for High Power Lasers, Boulder, CO (United States), 24-27 Sep 2017; Journal ID: ISSN 0277-786X
Publisher:
SPIE
Research Org:
Univ. of Rochester, NY (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Laser-induced damage; magnetorheological finishing
OSTI Identifier:
1426482