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Proceedings Paper

Evaluation of high-quality CaF2 single crystals for ultraviolet laser applications
Author(s): Shiro Sakuragi; Yutaka Taguchi; Hiroyuki Sato; Akinari Kasai; Hirokuni Nanba; Taketoshi Kawai; Satoshi Hashimoto
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Paper 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.

Paper Details

Date Published: 21 February 2005
PDF: 8 pages
Proc. SPIE 5647, Laser-Induced Damage in Optical Materials: 2004, (21 February 2005); doi: 10.1117/12.584849
Show Author Affiliations
Shiro Sakuragi, Union Materials Inc. (Japan)
Yutaka Taguchi, Union Materials Inc. (Japan)
Hiroyuki Sato, Union Materials Inc. (Japan)
Akinari Kasai, Union Materials Inc. (Japan)
Hirokuni Nanba, Union Materials Inc. (Japan)
Taketoshi Kawai, Osaka Women's Univ. (Japan)
Satoshi Hashimoto, Osaka Women's Univ. (Japan)

Published in SPIE Proceedings Vol. 5647:
Laser-Induced Damage in Optical Materials: 2004
Gregory J. Exarhos; Arthur H. Guenther; Norbert Kaiser; Keith L. Lewis; M. J. Soileau; Christopher J. Stolz, Editor(s)

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