Evaluation of high-quality CaF2 single crystals for ultraviolet laser applications

Shiro Sakuragi; Yutaka Taguchi; Hiroyuki Sato; Akinari Kasai; Hirokuni Nanba; Taketoshi Kawai; Satoshi Hashimoto

doi:10.1117/12.584849

21 February 2005 Evaluation of high-quality CaF<sub>2</sub> single crystals for ultraviolet laser applications

Shiro Sakuragi, Yutaka Taguchi, Hiroyuki Sato, Akinari Kasai, Hirokuni Nanba, Taketoshi Kawai, Satoshi Hashimoto

Proceedings Volume 5647, Laser-Induced Damage in Optical Materials: 2004; (2005) https://doi.org/10.1117/12.584849
Event: Boulder Damage Symposium XXXVI, 2004, Boulder, Colorado, United States

Abstract

High quality window/plate shaped CaF₂ single crystals have developed by vertical Bridgman method of with diameters of 50, 100, and 200 mm and 210 mm width, 200mm length. The CaF₂ windows of 30mm diameter obtained from big crystals have evaluated the transmission spectra from 120 nm to 220nm by single beam VUV spectrometer. We could obtain bulk transmission spectra by subtracting surface reflection loss between tow kinds of thickness samples. The results show flat spectra without distinct absorption from 130nm to 220nm. In laser-damage tests with the fourth harmonic (4ω) of a Nd:YAG laser below 1NW/cm² at the CaF₂ window, a stable output of 600mW was obtained. ArF laser irradiation of 50mJ/cm² and 6X10⁴ pulses was tried and the degradation in transmission from 130nm to 220nm not observed. These data show that the radiation hardness of our CaF₂ crystals is promising for deep ultra-violet laser applications.

Citation Download Citation

Shiro Sakuragi, Yutaka Taguchi, Hiroyuki Sato, Akinari Kasai, Hirokuni Nanba, Taketoshi Kawai, and Satoshi Hashimoto "Evaluation of high-quality CaF<sub>2</sub> single crystals for ultraviolet laser applications", Proc. SPIE 5647, Laser-Induced Damage in Optical Materials: 2004, (21 February 2005); https://doi.org/10.1117/12.584849

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