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crystalAkahane, Yutaka; Aoyama, Makoto; Sugiyama, Akira; Kubo, Ryoichi; Ogawa, Kanade; Tsuji, Koichi; Yamakawa, Koichi
Optics Letters, 33(5), p.494 - 496, 2008/03
Times Cited Count：2 Percentile：14.69(Optics)A diode-pumped, cryogenically-cooled Yb:LuLiF regenerative amplifier has been developed for the first time to our knowledge. A chirped-seed pulse was amplified and compressed in the regenerative amplifier, simultaneously, which generated 
6-mJ, 13-ps pulses at 999 nm wavelength without a pulse compressor. Simultaneous lasing at 999 nm and 1024 nm, respectively, was demonstrated, which could be used for different frequency generation in the THz region.
W/cm
intensity by focusing wavefront corrected 100 TW, 10 Hz laser pulsesAkahane, Yutaka; Ma, J.; Fukuda, Yuji; Aoyama, Makoto; Kiriyama, Hiromitsu; Inoue, Norihiro*; Tsuji, Koichi*; Nakai, Yoshiki*; Yamamoto, Yoichi*; Sheldakova, J. V.*; et al.
Japanese Journal of Applied Physics, Part 1, 44(8), p.6087 - 6089, 2005/08
Times Cited Count：1 Percentile：4.7(Physics, Applied)An improvement of laser-focused peak intensity has been achieved in a JAERI 100 TW Ti:sapphire chirped-pulse amplifier chain with a feedback-controlled adaptive optics system. Measurements of optical parameters of the laser pulse and an experimental tunneling ionization ratio of a rare gas atom with laser energy scaling have practically confirmed an ultrarelativistic intensity of over 10 W/cm operating at a 10 Hz repetition rate.
Kando, Masaki; Masuda, Shinichi; Zhidkov, A.*; Yamazaki, Atsushi; Kotaki, Hideyuki; Kondo, Shuji; Homma, Takayuki*; Kanazawa, Shuhei; Nakajima, Kazuhisa; Hayashi, Yukio; et al.
Physical Review E, 71(1), p.015403_1 - 015403_4, 2005/01
Times Cited Count：33 Percentile：77.37(Physics, Fluids & Plasmas)no abstracts in English
Fukuda, Yuji; Akahane, Yutaka; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki; Nakai, Yoshiki*; Tsuji, Koichi*; Yamakawa, Koichi; Hironaka, Yoichiro*; Kishimura, Hiroaki*; et al.
Applied Physics Letters, 85(21), p.5099 - 5101, 2004/11
Times Cited Count：11 Percentile：42.77(Physics, Applied)We have demonstrated diffraction from Si(111) crystal using X-rays from highly ionized Ar ions produced by laser irradiation with an intensity of 6
10
W/cm and a pulse duration of 30 fs acting upon micron-sized Ar clusters. The measured total photon flux and line width in the He
line (3.14 keV) were 410
photons/shot/4
sr and 3.7 eV (FWHM), respectively, which is sufficient to utilize as a debris-free light source for time-resolved X-ray diffraction studies.
-ray emission source developmentArisawa, Takashi; Matoba, Toru; Yamakawa, Koichi; Maruyama, Yoichiro; Sasuga, Tsuneo; Wakaida, Ikuo; Nakajima, Kazuhisa*; Sasaki, Akira; Minehara, Eisuke; Oshima, Masumi
Proc. of the 1st International Induced Gamma Emision Workshop, p.29 - 41, 1999/00
no abstracts in English
Akahane, Yutaka; Aoyama, Makoto; Sugiyama, Akira; Kubo, Ryoichi; Ogawa, Kanade; Tsuji, Koichi; Yamakawa, Koichi
no journal, ,
A diode-pumped, cryogenically-cooled Yb
:LuLiF
regenerative amplifier has been developed for the first time to our knowledge, which generated 6-mJ, 13-ps pulses at 999 nm wavelength without a pulse compressor.
:LuLiF crystalAkahane, Yutaka; Aoyama, Makoto; Kubo, Ryoichi; Sugiyama, Akira; Ogawa, Kanade; Tsuji, Koichi; Yamakawa, Koichi
no journal, ,
A diode-pumped, cryogenically-cooled Yb:LuLiF regenerative amplifier has been developed for the first time to our knowledge, which generated 6-mJ, 13-ps pulses at 999 nm wavelength without a pulse compressor.
Akahane, Yutaka; Aoyama, Makoto; Sugiyama, Akira; Kubo, Ryoichi; Tsuji, Koichi; Ogawa, Kanade; Yamakawa, Koichi
no journal, ,
We have developed a diode-pumped, cryogenically-cooled Yb:LuLiF regenerative amplifier, for the first time to our knowledge, which amplified 999 and 1024 nm chirped seed pulse to 6 and 8.5 mJ, respectively. Durations of amplified laser pulses in the regen were compressed to 13.2 ps and 27.4 ps in 999 and 1024 nm amplification, respectively, by gain-narrowing of chirped pulses, which enables us to apply output laser pulses to nonlinear applications directly without additional pulse compressor. We have also demonstrated simultaneous two-color lasing at 999 nm and 1024 nm, which could be used for different frequency generation in the THz region.
:LuLiF crystalAkahane, Yutaka; Aoyama, Makoto; Sugiyama, Akira; Kubo, Ryoichi*; Ogawa, Kanade; Tsuji, Koichi; Yamakawa, Koichi
no journal, ,
A diode-pumped regenerative amplification with cryogenically cooled Yb : LuLiF crystal has been demonstrated for the first time to our knowledge. A chirped-seed pulse was amplified and compressed in the regenerative amplifier, simultaneously, which generated 6 mJ, 13 ps pulses at 999 nm in wavelength and 8.5 mJ, 27 ps pulses at 1024 nm, respectively, without a pulse compressor. Simultaneous lasing at 999 and 1024 nm was demonstrated, which could be used for different frequency generation in the terahertz region.
:LuLiF crystalAkahane, Yutaka; Aoyama, Makoto; Sugiyama, Akira; Kubo, Ryoichi*; Ogawa, Kanade; Tsuji, Koichi; Yamakawa, Koichi
no journal, ,
We have performed chirped-pulse regenerative amplification at 999 nm and 1024 nm wavelengths with cryogenically-cooled Yb:LuLiF crystal. High-energy amplified pulses with energies of 6 mJ and 8.5 mJ were obtained at 999 nm and 1024nm wavelengths, respectively. In the regen durations of output pulses were compressed to 13 ps and 27 ps, respectively by gain-narrrwoing, so these pulses are available as pump sources for nonlinear effects without additional pulse compression devices. Simultaneous two-color lasing was also performed in this study, which is available for differential frequency generation in THz region.
Nomura, Takuji; Yamakawa, Yoichi*; Yanagi, Yuki*; Ono, Yoshiaki*
no journal, ,
Resonant inelastic X-ray scattering (RIXS) measurements at the Fe 
edge have been performed for recently discovered iron-pnictide superconductors. The aim of the present study is to analyze theoretically the results of the experiments. Specifically, we use a 16-band d-p model, where the Fe3d and As4p orbitals are taken into account, and the electron correlation effects are taken into account within the random-phase approximation (RPA).
Nomura, Takuji; Yamakawa, Yoichi*; Yanagi, Yuki*; Ono, Yoshiaki*
no journal, ,
no abstracts in English
Shamoto, Shinichi; Kajimoto, Ryoichi; Ishikado, Motoyuki*; Yamakawa, Yoichi*; Watashige, Tatsuya*; Kasahara, Shigeru*; Nakamura, Mitsutaka; Kontani, Hiroshi*; Shibauchi, Takasada*; Matsuda, Yuji*
no journal, ,
no abstracts in English
