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Kiriyama, Hiromitsu; Yamakawa, Koichi
Laser Physics, 16(4), p.666 - 672, 2006/04
Times Cited Count：4 Percentile：23.37(Optics)no abstracts in English
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
Maruyama, Yoichiro
Optical Engineering, 44(9), p.094202_1 - 094202_3, 2005/09
Times Cited Count：1 Percentile：7.74(Optics)A high average power BBO optical parametric oscillator pumped by a Nd:YAG laser second harmonic is demonstrated at the pulse repetition frequency of 0.5 kHz. Average power of 5.4 W (10.8 mJ) with the energy conversion efficiency of 45% is obtained for Type-I BBO OPO. The output power still increasing and undesirarble thermal effects are not observed.
beam with Nd:YAG laser in J-PARCTomisawa, Tetsuo; Akikawa, Hisashi; Sato, Susumu; Ueno, Akira; Kondo, Yasuhiro; Oigawa, Hiroyuki; Sasa, Toshinobu; Hasegawa, Kazuo; Lee, S.*; Igarashi, Zenei*; et al.
Proceedings of 7th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators (DIPAC 2005), p.275 - 277, 2005/00
The photo neutralization method with Nd:YAG laser for negative hydrogen ions has been expected as an available candidate for the transverse beam profile measurement. The fraction of photo detached electron can also be used for charge exchange procedure to extract very low power proton beam for Transmutation Experimental Facility in J-PARC. The laser system has advantages of maintenance and radiation hardness in high intensity proton accelerators. In order to establish the low power beam extraction system and beam profile monitor, the photo neutralization efficiency must be surveyed in practical beam line with high intensity H beam. In this paper, an experimental set-up and preliminary results of photo neutralization method for intense H beam in J-PARC MEBT1 are described.
Maruyama, Yoichiro; Kubomura, Hiroyuki*; Kasamatsu, Tadashi*; Matsuoka, Shinichi*; Nakano, Fumihiko*; Kan, Hirofumi*
JAERI-Tech 2004-056, 14 Pages, 2004/09
JAERI-Tech-2004-056.pdf:3.49MB
A high average power tunable solid state laser is pumped by the second harmonic of LD-pumped high repetition rate Nd:YAG laser consisting of a single-longitudinal-mode oscillator and amplifiers. To operate the Nd:YAG laser oscillator with a single-longitudinal-mode by injection seeding, the cavity length control is required to coincide the resonant frequency of Nd:YAG laser oscillator with the frequency of seeder. For this purpose, a cavity length control system of the Nd:YAG laser oscillator is developed and the characteristics are studied. With this system, the cavity length is controlled at the pulse repetition rate of 0.5 kHz and the single frequency operation for more than three hours is realized.
Kiriyama, Hiromitsu
Recent Research Developments in Optics, Vol.3, p.155 - 171, 2003/12
no abstracts in English
Kiriyama, Hiromitsu; Yamakawa, Koichi; Nagai, Toru; Kageyama, Nobuto*; Miyajima, Hirofumi*; Kan, Hirofumi*; Yoshida, Hidetsugu*; Nakatsuka, Masahiro*
Optics Letters, 28(18), p.1671 - 1673, 2003/09
Times Cited Count：29 Percentile：73.98(Optics)no abstracts in English
Kiriyama, Hiromitsu; Yamakawa, Koichi
Reza Gakkai Dai-313-Kai Kenkyukai Hokoku; Kokino Kotai Reza To Sono Oyo, p.1 - 6, 2003/09
no abstracts in English
O
crystalsKiriyama, Hiromitsu; Nakano, Fumihiko*; Yamakawa, Koichi
Journal of the Optical Society of America B, 19(8), p.1857 - 1864, 2002/08
Times Cited Count：7 Percentile：36.27(Optics)no abstracts in English
Maruyama, Yoichiro; Oba, Masaki; Kato, Masaaki
JAERI-Tech 2002-004, 13 Pages, 2002/02
JAERI-Tech-2002-004.pdf:3.65MB
For the in-situ measurement of various substances in the atmosphere by using DIAL (Differential Absorption LIDAR) , a high repetition rate tunable laser is required to obtain data within a few seconds. As the pump source of the tunable laser, the performance of high repetition rate and high average power is indispensable. For the generation of high quality laser radiation, a laser oscillator with 1 kHz pulse repetition rate is made and seeded with very narrow linewidth single-longitudinal mode laser radiation from the outside of the oscillator cavity and its characteristics are studied. As the results, after the thermal equilibrium of the oscillator laser crystal, a single-longitudinal and near TEMoo transverse mode are realized at the pulse repetition rate between 0.5kHz and 1kHz. Single frequency operation is preserved by controlling the cavity length. The average output power of 3W (3mJ per pulse) is obtained. It is confirmed that this oscillator has enough performance as a oscillator of MOPA (Master Oscillator Power amplifier) system.
Oba, Masaki; Maruyama, Yoichiro
JAERI-Research 2001-040, 24 Pages, 2001/08
JAERI-Research-2001-040.pdf:2.35MB
no abstracts in English
Al
O
single crystals by double crucible methodKatsurayama, Masamichi*; Anzai, Yutaka*; Sugiyama, Akira; Koike, Masato; Kato, Yoshiaki
Journal of Crystal Growth, 229(1-4), p.193 - 198, 2001/07
Times Cited Count：34 Percentile：89.4(Crystallography)no abstracts in English
Kiriyama, Hiromitsu; Matsuoka, Shinichi*; Arisawa, Takashi
JAERI-Research 2001-031, 8 Pages, 2001/05
JAERI-Research-2001-031.pdf:0.44MB
no abstracts in English
O crystalsKiriyama, Hiromitsu; Matsuoka, Shinichi*; Nakano, Fumihiko*; Yamakawa, Koichi
JAERI-Research 2001-019, 7 Pages, 2001/03
JAERI-Research-2001-019.pdf:0.39MB
no abstracts in English
Kiriyama, Hiromitsu; Matsuoka, Shinichi; Maruyama, Yoichiro; Arisawa, Takashi
Nuclear Instruments and Methods in Physics Research A, 455(1), p.236 - 238, 2001/01
Times Cited Count：0 Percentile：0.01(Instruments & Instrumentation)no abstracts in English
O crystals for highy efficient second-harmonic generation of high-power Nd:YAG laserKiriyama, Hiromitsu; Nakano, Fumihiko*; Yamakawa, Koichi
Technical Digest on 4th Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim 2001), p.II_150 - II_151, 2001/00
no abstracts in English
Sugiyama, Akira; Fukuyama, Hiroyasu*; Katsurayama, Masamichi*; Anzai, Yutaka*
Denki Gakkai Hikari, Ryoshi Debaisu Kenkyukai OQD-00-50, p.23 - 28, 2000/10
no abstracts in English
Kiriyama, Hiromitsu; Nakano, Fumihiko*; Yamakawa, Koichi
Shingaku Giho, 100(391), p.37 - 42, 2000/10
no abstracts in English
O crystals for the efficient second-harmonic generation of high power Nd:YAG laserKiriyama, Hiromitsu; Matsuoka, Shinichi; Nakano, Fumihiko*; Yamakawa, Koichi
Optical Review, 7(4), p.281 - 283, 2000/07
Times Cited Count：1 Percentile：10.06(Optics)no abstracts in English
Kiriyama, Hiromitsu; Matsuoka, Shinichi; Maruyama, Yoichiro; Arisawa, Takashi
Optics Communications, 174(5-6), p.499 - 502, 2000/02
Times Cited Count：6 Percentile：34.69(Optics)no abstracts in English
