A microscopic model for long-term laser damage in calcium fluoride

Stephan Rix; Ute Natura; Martin Letz; Claudia Felser; Lutz Parthier

doi:10.1117/12.836404

31 December 2009 A microscopic model for long-term laser damage in calcium fluoride

Stephan Rix, Ute Natura, Martin Letz, Claudia Felser, Lutz Parthier

Proceedings Volume 7504, Laser-Induced Damage in Optical Materials: 2009; 75040J (2009) https://doi.org/10.1117/12.836404
Event: Laser Damage Symposium XLI: Annual Symposium on Optical Materials for High Power Lasers, 2009, Boulder, Colorado, United States

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.

Citation Download Citation

Stephan Rix, Ute Natura, Martin Letz, Claudia Felser, and Lutz Parthier "A microscopic model for long-term laser damage in calcium fluoride", Proc. SPIE 7504, Laser-Induced Damage in Optical Materials: 2009, 75040J (31 December 2009); https://doi.org/10.1117/12.836404

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