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Advanced surface processing of NLO borate crystals for UV generation
Mori, Yusuke,Kamimur, Tomosumi,Yoshimura, Masashi,Sasaki, Takatomo The Korea Association of Crystal Growth 1999 韓國結晶成長學會誌 Vol.9 No.5
Recent advances in NLO Borate Crystals for UV Generation are reviewed with the particular emphasis on the technique to improve the life time of UV optics. The laser-damage resistance of CLBO and fused silica surfaces was successfully improved after removing polishing compound by ion beam etching. The polishing compound embedded in the CLBO and fused silica surfaces were to a depth of less than 100nm. We were able to remove polishing compound without degrading the surface condition when the applied ion beam voltage was less than 200 V. The laser-induced surface damage threshold of CLBO was improved up to 15J/$\textrm{cm}^2$(wavelength: 355 nm, pulse width: 0.85 ns)as compared with that of the as-polished surface (11 J/$\textrm{cm}^2$). The laser-induced surface damage of fused silica also increased from 7.5J/$\textrm{cm}^2$ to 15J/$\textrm{cm}^2$. For the irradiation of a 266 nm high-intensity and high-repetition laser light, the surface lifetime of CLBO and fused silica could be more doubled compared with that of the as-polished surface.
Michiaki TOYODA,Kazuhisa OBA,Tetsuya YANAGIMOTO,Takatomo MORI,Kazuo HEMMI 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, we propose a method to update numeral template images according to the width of characters for holistic matching. The purpose of our study is to develop a method that discriminates between correct patterns and incorrect patterns by matching input images against template images. We applied this method to handwritten class marks of book labels to assist librarians in Japanese libraries to find misshelved books. In experiments, initial numeral template images are gathered randomly from isolated characters. We confirmed that the proposed method is useful to increase the variation of the width of template images.