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New Method to Measure the Rise Time of a Fast Pulse Slicer for Laser Ion Acceleration Research
Mori, Michiaki,Yogo, Akifumi,Kiriyama, Hiromitsu,Nishiuchi, Mamiko,Ogura, Koichi,Orimo, Satoshi,Ma, Jinglong,Sagisaka, Akito,Kanazawa, Shuhei,Kondo, Shuji,Nakai, Yoshiki,Akutsu, Atsushi,Yamamoto, Yoic IEEE 2008 IEEE transactions on plasma science Vol.36 No.4
<P> A dependence of cutoff proton kinetic energy on laser prepulse duration has been observed. Amplified spontaneous emission pedestal duration is controlled by a fast electrooptic pulse slicer where the rise time is estimated to be 130 ps. We demonstrate a new correlated spectral technique for determining this rise time using a stretched frequency-chirped pulse. </P>
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.
Development of Laser-driven Proton Source Toward Its Applications
Akito Sagisaka,Hiroyuki Daido,Alexander S. Pirozhkov,Akifumi Yogo,Koichi Ogura,Satoshi Orimo,Jinglong Ma,Michiaki Mori,Mamiko Nishiuchi,Sergei V. Bulanov,Timur Zh. Esirkepov,Yuji Oishi,Takuya Nayuki,T 한국광학회 2009 Current Optics and Photonics Vol.13 No.1
We observe the proton signals produced by laser interaction with thin-foil targets of polyimide and of copper. We change the thickness of the polyimide target to 7.5 μm, 12.5 μm, and 50 μm. High-energy protons with the maximum energy of ~2.3 MeV from 7.5 μm thick polyimide are observed. This proton beam with the maximum energy of multi-MeV has various applications such as a proton shadowgraphy.