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Kiriyama, Hiromitsu; Yamakawa, Koichi; Kageyama, Nobuto*; Miyajima, Hirofumi*; Kan, Hirofumi*; Yoshida, Hidetsugu*; Nakatsuka, Masahiro*
Japanese Journal of Applied Physics, Part 1, 44(10), p.7464 - 7471, 2005/10
Times Cited Count：2 Percentile：9.28(Physics, Applied)no abstracts in English
Iijima, Hokuto; Hajima, Ryoichi; Nagai, Ryoji; Minehara, Eisuke; Yamauchi, Toshihiko
Proceedings of 2nd Annual Meeting of Particle Accelerator Society of Japan and 30th Linear Accelerator Meeting in Japan, p.793 - 795, 2005/07
We report the construction of FEL transport line and the measurement method of chirped FEL pulse. An infrared-chirped pulse is an effective way of dissociating molecules. The chirped FEL pulse oscillator is operated by the JAERI-FEL superconducting accelerator, in which a long pulse of electron beam is produced. Until now, the chirped pulse was measured to be 
= 14.3% with the wavelength of 23.3 
m and the pulse width of 319 fs at FWHM by an autocorrelation. In order to measure the correlation between time and frequency in the chirped pulse directly, the frequency-resolved optical grating (FROG) is developing. Since the measurement is performed in new experimental room, the vacuum transport line guiding the FEL to the room has been constructed.
Hajima, Ryoichi; Nagai, Ryoji
Physical Review Letters, 91(2), p.024801_1 - 024801_4, 2003/07
Times Cited Count：39 Percentile：81.74(Physics, Multidisciplinary)We study the generation of a self-chirped optical pulse in an FEL oscillator. In a high-gain FEL oscillator, frequency chirp is induced in the slippage region as a result of superradiant FEL resonance, and this time-frequency correlation evolves continuously into a few-cycle regime, if the optical cavity length is perfectly synchronized to the electron bunch interval. Numerical simulations based on slowly-evolving-wave-approximation (SEWA) and experimental results are presented.
Fukuda, Yuji; Yamakawa, Koichi; Akahane, Yutaka; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki; Kishimoto, Yasuaki
Physical Review A, 67(6), p.061201_1 - 061201_4, 2003/06
Times Cited Count：57 Percentile：88.31(Optics)We have probed the interaction of intense laser fields with Xe clusters by measuring the energy and charge state distributions of emitted ions and electrons using ultrafast 20 fs pulses. This work demonstrates that the energetic particle emissions from laser-cluster interactions can be optimized by manipulating the character of ultrafast laser pulses, i.e. pulse duration and sign of chirp.
Nishimura, Akihiko; Akaoka, Katsuaki; Ozu, Akira; Sugiyama, Akira; Usami, Tsutomu*; Matoba, Toru
Advanced High-power Lasers (Proceedings of SPIE Vol.3889), p.414 - 419, 2000/00
no abstracts in English
