21 February 2005 Evaluation of high-quality CaF<sub>2</sub> single crystals for ultraviolet laser applications
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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.
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Shiro Sakuragi, Shiro Sakuragi, Yutaka Taguchi, Yutaka Taguchi, Hiroyuki Sato, Hiroyuki Sato, Akinari Kasai, Akinari Kasai, Hirokuni Nanba, Hirokuni Nanba, Taketoshi Kawai, Taketoshi Kawai, Satoshi Hashimoto, 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); doi: 10.1117/12.584849; https://doi.org/10.1117/12.584849

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