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10
W/cm
Skobelev, I. Yu.*; Ryazantsev, S. N.*; Kulikov, R. K.*; Sedov, M. V.*; Filippov, E. D.*; Pikuz, S. A.*; Asai, Takafumi*; Kanasaki, Masato*; Yamauchi, Tomoya*; Jinno, Satoshi; et al.
Photonics (Internet), 10(11), p.1250_1 - 1250_11, 2023/11
Times Cited Count：0 Percentile：0(Optics)It is challenging to clearly distinguish the impacts of the optical field and collisional ionization in the evolution of the charge state of a plasma produced when matter interacts with high-intensity laser pulses. In this work, time-dependent calculations of plasma kinetics are used to show that it is possible only when low-density gaseous targets with sufficiently small clusters are used. In the case of Ar plasma, the upper limit of the cluster radius was estimated to be 
m.
Kim, C. M.*; Steil, H.*; Matou
, B.*; Nishikino, Masaharu; Hasegawa, Noboru; Kawachi, Tetsuya; Tran, K. A.*; Janulewicz, K. A.*
Physical Review A, 92(4), p.043807_1 - 043807_7, 2015/10
Times Cited Count：3 Percentile：19(Optics)We present polarization measurement of a Ni-like Ag X-ray laser working in the transient collisional excitation scheme. A calibrated membrane multilayer beam splitter was used to determine the energies of two mutually perpendicular polarization components (s and p components). As a result, we observed a high degree of polarization that fluctuated from shot to shot. The dominant polarization component switched from s to p when pumping was made stronger. The measurement results are discussed from the point of view of the general polarization theory and supported by a numerical simulation based on Maxwell-Bloch equations.
Nishiuchi, Mamiko
Hoshasen Kagaku (Internet), (97), p.13 - 27, 2014/00
Since the first observation of the energetic protons from the interaction between the short pulse high intensity laser and the thin-foil target, extensive studies have been carried out for more than 15 years. In the early period, the laser energy of kilo joule level is necessary to accelerate the protons more than 50 MeV. Such a large amount of laser energy is supplied only by a huge laser system, which typically is unable to make repetitive operation. However, thanks to the progresses in the laser technology, protons having the energies almost 50 MeV are successfully accelerated by the laser system with only less than 10 J of energy and with the capability of repetitive operation. These facts really show the advance of the laser-driven ion acceleration towards the possible fields of applications. Here in this paper the characteristics, the mechanisms and the recent experimental results of the laser-driven proton acceleration are shown.
Sagisaka, Akito; Utsumi, Takayuki*; Daido, Hiroyuki; Ogura, Koichi; Orimo, Satoshi; Takai, Mamiko; Hayashi, Yukio; Mori, Michiaki; Yogo, Akifumi; Kado, Masataka; et al.
Journal of Plasma Physics, 72(6), p.1281 - 1284, 2006/12
Times Cited Count：0 Percentile：0.01(Physics, Fluids & Plasmas)no abstracts in English
Bulanov, S. V.; Yamagiwa, Mitsuru; Esirkepov, T. Z.; Koga, J. K.; Kando, Masaki; Ueshima, Yutaka; Saito, Kanji; Wakabayashi, Daisuke*
Physics of Plasmas, 12(7), p.073103_1 - 073103_11, 2005/07
Times Cited Count：27 Percentile：64.62(Physics, Fluids & Plasmas)no abstracts in English
' X-ray transitions from 
1 
m Kr clusters irradiated by high-intensity femtosecond laser pulsesHansen, S. B.*; Fournier, K. B.*; Faenov, A. Y.*; Magunov, A. I.*; Pikuz, T. A.*; Skobelev, I. Y.*; Fukuda, Yuji; Akahane, Yutaka; Aoyama, Makoto; Inoue, Norihiro*; et al.
Physical Review E, 71(1), p.016408_1 - 016408_9, 2005/01
Times Cited Count：16 Percentile：57.67(Physics, Fluids & Plasmas)X-ray line emission from ' transitions in Ne-like Kr and nearby ions has been observed from 1 m Kr clusters irradiated by fs-scale laser pulses at the JAERI facility in Kyoto, Japan. The dependence of X-ray spectral features and intensity on the incident laser intensity is rather weak, indicating that the 1-2 ps cluster lifetimes limit the number of ions beyond Ne-like Kr that can be produced by collisional ionization. A collisional-radiative model based on the relativistic multiconfigured FAC code has been constructed and used to determine that the cluster plasma has electron densities near 10
cm
, temperature of a few hundred eV and hot electron fraction of a few percent.
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 610
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.
Koga, J. K.
Physical Review E, 70(5), p.056404_1 - 056404_5, 2004/11
Times Cited Count：3 Percentile：16.62(Physics, Fluids & Plasmas)The propagation of high power short pulse laser pulses in neutral gases is a surprisingly complex phenomenon. In order to study the detailed propagation dynamics a code has been developed which explicitly solves Maxwell's equations including the finite response time background neutral gas polarization and optical field ionization. In large scale two dimensional simulations of a high power laser pulse propagating in Hydrogen-like gas the generation of ultra-broadband white light, the so-called supercontinuum generation, is observed.
Koga, J. K.
Physical Review E, 70(4), p.046502_1 - 046502_5, 2004/10
Times Cited Count：38 Percentile：79.44(Physics, Fluids & Plasmas)no abstracts in English
Kotaki, Hideyuki; Masuda, Shinichi; Kando, Masaki; Kondo, Shuji; Kanazawa, Shuhei; Homma, Takayuki; Nakajima, Kazuhisa
Quantum Aspects of Beam Physics 2003, p.119 - 124, 2004/10
Times Cited Count：0 Percentile：0.4(Astronomy & Astrophysics)no abstracts in English
Smirnov, M. B.*; Skobelev, I. Y.*; Magunov, A. I.*; Faenov, A. Y.*; Pikuz, T. A.*; Fukuda, Yuji; Yamakawa, Koichi; Akahane, Yutaka; Aoyama, Makoto; Inoue, Norihiro*; et al.
Journal of Experimental and Theoretical Physics, 98(6), p.1123 - 1132, 2004/06
Interaction between high-power ultrashort laser pulse and giant clusters (microdroplets) consisting of 10
to 10
atoms is considered. The microdroplet size is comparable to the laser wavelength. A model of the evolution of a microdroplet plasma induced by a high-power laser pulse is developed, and the processes taking place after interaction with the pulse are analyzed. It is shown theoretically that the plasma is superheated: its temperature is approximately equal to the ionization potential of an ion having a typical charge. The microdroplet plasma parameters are independent of the pulse shape and duration. The theoretical conclusions are supported by experimental studies of X-ray spectra conducted at JAERI, where a 100-terawatt Ti-sapphire lasersystem was used to irradiate krypton and xenon microdroplets by laser pulses with pulse widths of 30 to 500 fs and intensities of 610
to 210
W/cm.
Sagisaka, Akito; Daido, Hiroyuki; Ogura, Koichi; Orimo, Satoshi; Hayashi, Yukio; Nishiuchi, Mamiko; Mori, Michiaki; Matsukado, Koji*; Fukumi, Atsushi*; Li, Z.*; et al.
Applied Physics B, 78(7-8), p.919 - 922, 2004/05
Times Cited Count：26 Percentile：70.25(Optics)no abstracts in English
Esirkepov, T. Z.; Borghesi, M.*; Bulanov, S. V.; Mourou, G.*; Tajima, Toshiki
Physical Review Letters, 92(17), p.175003_1 - 175003_4, 2004/04
Times Cited Count：900 Percentile：99.76(Physics, Multidisciplinary)An intense laser-plasma interaction regime of the generation of high density ultra-short relativistic ion beam is suggested. When the radiation pressure is dominant, the laser energy is transformed effciently into the energy of fast ions.
Tajima, Toshiki
Pariti, 19(3), p.4 - 81, 2004/03
no abstracts in English
Matsukado, Koji*; Esirkepov, T. Z.; Kinoshita, Kenichi*; Daido, Hiroyuki; Utsumi, Takayuki*; Li, Z.*; Fukumi, Atsushi*; Hayashi, Yukio; Orimo, Satoshi; Nishiuchi, Mamiko; et al.
Physical Review Letters, 91(21), p.215001_1 - 215001_4, 2003/11
Times Cited Count：136 Percentile：95.25(Physics, Multidisciplinary)no abstracts in English
Daido, Hiroyuki
Reza Kenkyu, 31(11), p.696 - 697, 2003/11
no abstracts in English
Daido, Hiroyuki
Reza Kenkyu, 31(11), p.698 - 706, 2003/11
no abstracts in English
Kim, J.*; Kim, D. E.*; Kawachi, Tetsuya; Hasegawa, Noboru; Sukegawa, Kota*; Iwamae, Atsushi*; Fujimoto, Takashi*
Journal of the Optical Society of Korea, 7(3), p.145 - 149, 2003/09
The anistropy of electron energy distribution in oxygen plasmas produced by a high intensinty laser was investigated by using polarization spectroscopy. An ultra-short pulsed laser with a pulse duration of 66.5 fs and a power density of 110
W/cm was used. At this power density and pulse duration, the plasma was generated predominantly by optical field ionization. The degree of polarization of OVI 1s2p P-1s4d D
(J=1/2-3/2 and J=3/2-5/2) transition line at 129.92 
の1s 2pP-1s4sS (J=1/2-1/2 and J=3/2-1/2) transition line at 132.26 AA was used to calibrate the sensitivity of the optical system. The dependencies of the degree of polarization on the initial gas density and on the laser polarization were investigated. When the laser polarization was changed from a linear to a circlar polarization was decreased. When the initial gas density was increased, the degree of polarization was decreased.
Bulanov, S. V.*; Esirkepov, T. Z.; Tajima, Toshiki
Physical Review Letters, 91(8), p.085001_1 - 085001_4, 2003/08
Times Cited Count：344 Percentile：98.85(Physics, Multidisciplinary)A method to generate ultrahigh intense electromagnetic fields is suggested, based on the laser pulse compression, carrier frequency upshift and focusing by a counter-propagating breaking plasma wave, relativistic flying parabolic mirror. This method allows us to achieve the quantum electrodynamics critical field (Schwinger limit) with present day laser systems
Moribayashi, Kengo
Nuclear Instruments and Methods in Physics Research B, 205, p.346 - 349, 2003/05
Times Cited Count：2 Percentile：21.31(Instruments & Instrumentation)no abstracts in English
