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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 10 — May. 11, 2009
  • pp: 8253–8263

Exterior surface damage of calcium fluoride outcoupling mirrors for DUV lasers

Michael Bauer, Martin Bischoff, Sigrid Jukresch, Thomas Hülsenbusch, Ansgar Matern, Andreas Görtler, Robert W. Stark, Andrey Chuvilin, and Ute Kaiser  »View Author Affiliations


Optics Express, Vol. 17, Issue 10, pp. 8253-8263 (2009)
http://dx.doi.org/10.1364/OE.17.008253


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Abstract

Damage of optical components due to laser irradiation reduces reliability and limits durability. Calcium fluoride (CaF2) is commonly used for deep UV laser optics because it shows a very low tendency of color center formation as, compared to other UV-X optical materials. Here, we report on the exterior damage of CaF2 UV-X optics due to radiation with high pulse-energy densities (80 mJ/cm2) from an ArF laser. At such high energy densities, damage occurs on the external resonator side. The damage is generated by a partial alteration of the CaF2 substrate to crystalline CaCO3 (calcite). The decomposition of CaF2 is mainly driven by photochemical processes in the presence of water vapor, which are induced by the UV-laser light and the elevated temperature within the beam profile.

© 2009 Optical Society of America

OCIS Codes
(140.2180) Lasers and laser optics : Excimer lasers
(140.3330) Lasers and laser optics : Laser damage
(230.4040) Optical devices : Mirrors
(260.7200) Physical optics : Ultraviolet, extreme

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: March 5, 2009
Revised Manuscript: April 7, 2009
Manuscript Accepted: April 10, 2009
Published: April 30, 2009

Citation
Michael Bauer, Martin Bischoff, Sigrid Jukresch, Thomas Hülsenbusch, Ansgar Matern, Andreas Görtler, Robert W. Stark, Andrey Chuvilin, and Ute Kaiser, "Exterior surface damage of calcium fluoride outcoupling mirrors for DUV lasers," Opt. Express 17, 8253-8263 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-10-8253


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