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Ochi, Yoshihiro; Kawachi, Tetsuya; Hasegawa, Noboru; Nagashima, Keisuke; Nishikino, Masaharu; Kishimoto, Maki; Tanaka, Momoko
Reza Kenkyu, 36(APLS), p.1136 - 1138, 2008/12
We have developed a chirped pulse amplification laser with flash lamp pumped zigzag slab Nd:glass amplifiers for pumping the TCE X-ray lasers at 0.1-Hz repetition rate at the Japan Atomic Energy Agency. The laser provided 7 J/1.6 ps main pulse and 1/8 intensity pre-pulse at 1.2 ns before the main pulse. An energy fluctuation at 0.1-Hz operation was 20% (RMS), which was comparable with our present laser using rod amplifiers. The line focus on the target surface was 20 
m in the width and 0.8 cm in the length. By using this laser, gain saturated Ni-like silver laser (
= 13.9 nm) with energy output of 
1 J was obtained. In this case, the gain coefficient (G) was 41.9 cm
up to the plasma length (L) of 0.39 cm, resulting G 
L = 16.3. The beam divergence of the Ni-like silver laser was 
3 mrad. Consequently, the peak spectrum brilliance was estimated to be 10
photons/s/mm
/mrad2/0.1%BW.
Furukawa, Yusuke*; Tanaka, Momoko; Murakami, Hidetoshi*; Saito, Shigeki*; Sarukura, Nobuhiko*; Nishikino, Masaharu; Yamatani, Hiroshi; Nishimura, Hiroaki*; Mima, Kunioki*; Kagamitani, Yuji*; et al.
Reza Kenkyu, 36(APLS), p.1028 - 1030, 2008/12
Optical technologies in extreme ultraviolet (EUV) region have been receiving strong interests for the next generation lithography. Here we report properties of ZnO as scintillators in the EUV region, and to demonstrate the feasibility of using a Ni-like Ag EUV laser operated at 13.9-nm to evaluate these properties. The ZnO sample was irradiated with EUV laser pulses and the fluorescence was measured using a streak camera fitted with a spectrograph. A clear, excitonic, fluorescence peak was observed at around 380 nm with a decay lifetime of 3 ns. The prominent peak fluorescence is ideal for EUV detection and further applications including imaging.
Sasaki, Akira; Sunahara, Atsushi*; Nishihara, Katsunobu*; Nishikawa, Takeshi*; Koike, Fumihiro*; Tanuma, Hajime*
Reza Kenkyu, 36(Suppl.), p.1132 - 1135, 2008/11
no abstracts in English
Itakura, Ryuji
no journal, ,
We propose a method for characterizing attosecond pulses by means of angle-resolved photoelectron spectroscopy of alkali-metal atoms in the P state. Photoelectron spectroscopy of a coherent superposition of the spin-orbit split P
and P
levels allows us to observe the spectral shearing interference through the measurement of the quantum beat between the two levels. We show that the phase offset of the quantum beat in alkali-metal atoms is directly utilized for determining the spectral phase of attosecond pulses.
Daido, Hiroyuki
no journal, ,
no abstracts in English
Chen, L. M.
no journal, ,
