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Title: System and method for laser-based, non-evaporative repair of damage sites in the surfaces of fused silica optics

Patent ·
OSTI ID:1322102
; ; ; ; ; ; ;

A method for repairing a damage site on a surface of an optical material is disclosed. The method may involve focusing an Infrared (IR) laser beam having a predetermined wavelength, with a predetermined beam power, to a predetermined full width ("F/W") 1/e.sup.2 diameter spot on the damage site. The focused IR laser beam is maintained on the damage site for a predetermined exposure period corresponding to a predetermined acceptable level of downstream intensification. The focused IR laser beam heats the damage site to a predetermined peak temperature, which melts and reflows material at the damage site of the optical material to create a mitigated site.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC52-07NA27344
Assignee:
Lawrence Livermore National Security, LLC (Livermore, CA)
Patent Number(s):
9,434,645
Application Number:
13/707,053
OSTI ID:
1322102
Resource Relation:
Patent File Date: 2012 Dec 06
Country of Publication:
United States
Language:
English

References (13)

Method of, and apparatus for, repairing mechanical and/or chemical damage to the surface of bottles destined for re-use patent March 1988
Fabrication of devices using phosphorus glasses patent March 1988
Localized surface glazing of ceramic articles patent June 1995
Method for producing damage resistant optics patent February 2003
Method and apparatus for repair of defects in materials with short laser pulses patent April 2005
Carbon dioxide laser polishing of fused silica surfaces for increased laser-damage resistance at 1064 nm journal January 1982
Methods for mitigating surface damage growth in NIF final optics conference March 2002
Mitigation of laser damage growth in fused silica NIF optics with a galvanometer scanned CO 2 laser conference May 2006
Mitigation of growth of laser initiated surface damage in fused silica using a 4.6-micron wavelength laser
  • Guss, Gabe; Bass, Isaac; Draggoo, Vaughn
  • Boulder Damage Symposium XXXVIII: Annual Symposium on Optical Materials for High Power Lasers https://doi.org/10.1117/12.696084
conference October 2006
Downstream intensification effects associated with CO 2 laser mitigation of fused silica
  • Matthews, Manyalibo J.; Bass, Isaac L.; Guss, Gabriel M.
  • Boulder Damage Symposium XXXIX: Annual Symposium on Optical Materials for High Power Lasers, SPIE Proceedings https://doi.org/10.1117/12.752948
conference October 2007
Optimization of a laser mitigation process in damaged fused silica journal March 2009
Results of applying a non-evaporative mitigation technique to laser-initiated surface damage on fused-silica
  • Adams, J. J.; Bolourchi, M.; Bude, J. D.
  • Laser Damage Symposium XLII: Annual Symposium on Optical Materials for High Power Lasers https://doi.org/10.1117/12.867652
conference November 2010
Mitigation of laser damage growth in fused silica with a galvanometer scanned CO2 laser
  • Bass, Isaac L.; Guss, Gabriel M.; Hackel, Richard P.
  • Boulder Damage Symposium XXXVII: Annual Symposium on Optical Materials for High Power Lasers https://doi.org/10.1117/12.638828
conference December 2005

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