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Proceedings Paper

A microscopic model for long-term laser damage in calcium fluoride
Author(s): Stephan Rix; Ute Natura; Martin Letz; Claudia Felser; Lutz Parthier
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Paper Abstract

Single crystal calcium fluoride (CaF2) is an important lens material in deep-ultraviolet optics, where it is exposed to high radiation densities. The known rapid damage process in CaF2 upon ArF laser irradiation cannot account for irreversible damage after long irradiation times. We use density functional methods to calculate the properties of laser-induced point defects and to investigate defect stabilization mechanisms on a microscopic level. The mobility of the point defects plays a major role in the defect stabilization mechanisms. Besides stabilization by impurities, we find that the agglomeration of F-centers plays a significant role in long-term laser damage of CaF2. We present calculations on the stability of defect structures and the diffusion properties of the point defects.

Paper Details

Date Published: 31 December 2009
PDF: 8 pages
Proc. SPIE 7504, Laser-Induced Damage in Optical Materials: 2009, 75040J (31 December 2009); doi: 10.1117/12.836404
Show Author Affiliations
Stephan Rix, SCHOTT AG (Germany)
Johannes Gutenberg Univ. Mainz (Germany)
Ute Natura, SCHOTT AG (Germany)
Martin Letz, SCHOTT AG (Germany)
Claudia Felser, Johannes Gutenberg Univ. Mainz (Germany)
Lutz Parthier, SCHOTT AG (Germany)

Published in SPIE Proceedings Vol. 7504:
Laser-Induced Damage in Optical Materials: 2009
Gregory J. Exarhos; Vitaly E. Gruzdev; Detlev Ristau; M. J. Soileau; Christopher J. Stolz, Editor(s)

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