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Pirozhkov, A. S.; Ragozin, E. N.*
Physics-Uspekhi, 58(11), p.1095 - 1105, 2015/11
Times Cited Count：35 Percentile：58.04(Physics, Multidisciplinary)Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Faenov, A. Y.*; Pikuz, T. A.*; Kawachi, Tetsuya; Sagisaka, Akito; Koga, J. K.; Mori, Michiaki; Kawase, Keigo*; et al.
RAL-TR-2015-025, P. 22, 2015/00
Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A. Ya.*; Pikuz, T. A.*; Kawachi, Tetsuya; Sagisaka, Akito; et al.
New Journal of Physics (Internet), 16(9), p.093003_1 - 093003_30, 2014/09
Times Cited Count：31 Percentile：79.23(Physics, Multidisciplinary)Esirkepov, T. Z.; Pirozhkov, A. S.; Kando, Masaki; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A.*; Pikuz, T. A.; Kawachi, Tetsuya; Sagisaka, Akito; et al.
AIP Conference Proceedings 1465, p.172 - 180, 2012/07
Times Cited Count：0 Percentile：0.00(Physics, Applied)The bow wave induced mechanism of high-order harmonics generation was discovered using simulations and catastrophe theory. This mechanism feasibility was successfully demonstrated in 3D and 2D PIC simulations. The mechanism and the simulations explained high-order harmonics in the XUV spectral region seen in recent experiments with terawatt lasers. Development of new XUV light and X-ray source based on the high-order harmonics generation mechanism is proposed.
Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A. Ya.*; Pikuz, T. A.; Kawachi, Tetsuya; Sagisaka, Akito; et al.
AIP Conference Proceedings 1465, p.167 - 171, 2012/07
Times Cited Count：1 Percentile：44.53(Physics, Applied)Kando, Masaki; Pirozhkov, A. S.; Nakamura, Tatsufumi; Hayashi, Yukio; Kotaki, Hideyuki; Kawase, Keigo*; Esirkepov, T. Z.; Fukuda, Yuji; Kiriyama, Hiromitsu; Okada, Hajime; et al.
AIP Conference Proceedings 1465, p.159 - 166, 2012/07
Times Cited Count：0 Percentile：0.00(Physics, Applied)Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A. Ya.*; Pikuz, T. A.; Kawachi, Tetsuya; Sagisaka, Akito; et al.
Physical Review Letters, 108(13), p.135004_1 - 135004_5, 2012/03
Times Cited Count：74 Percentile：90.19(Physics, Multidisciplinary)We demonstrate a new high-order harmonic generation mechanism reaching the "water window" spectral region in experiments with multi-terawatt femtosecond lasers irradiating gas jets. A few hundred harmonic orders are resolved, giving 
J/sr pulses. Harmonics are collectively emitted by an oscillating electron spike formed at the joint of the boundaries of a cavity and bow wave created by a relativistically self-focusing laser in underdense plasma. The spike sharpness and stability are explained by catastrophe theory. The mechanism is corroborated by particle-in-cell simulations.
Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A. Ya.*; Pikuz, T. A.; Koga, J. K.; Kiriyama, Hiromitsu; et al.
Proceedings of SPIE, Vol.8140, p.81400A_1 - 81400A_16, 2011/10
Kawase, Keigo; Kando, Masaki; Pirozhkov, A. S.; Homma, Takayuki; Kameshima, Takashi*; Daito, Izuru; Hayashi, Yukio; Kotaki, Hideyuki; Fukuda, Yuji; Esirkepov, T. Zh.; et al.
Applied Physics Express, 3, p.016101_1 - 016101_3, 2010/01
Times Cited Count：2 Percentile：9.84(Physics, Applied)A new observation method of providing a precise collision of two full-power counter-propagating laser pulses is proposed and demonstrated. The method is a combination of top-view imaging, side-view shadowgram, extra-ultraviolet (XUV) spectrograph, and returning pulse monitoring. This allows us to align two counter-propagating laser pulses at their colliding point in a real situation (full power laser operation in plasma). The achieved spatial resolution of the monitor in the plasma is 1.35 
with the precision level of alignment better than 15 even when there is plasma present.
Kando, Masaki; Pirozhkov, A. S.; Kawase, Keigo; Esirkepov, T. Zh.; Fukuda, Yuji; Kiriyama, Hiromitsu; Okada, Hajime; Daito, Izuru; Kameshima, Takashi; Hayashi, Yukio; et al.
Physical Review Letters, 103(23), p.235003_1 - 235003_4, 2009/12
Times Cited Count：108 Percentile：93.69(Physics, Multidisciplinary)Kando, Masaki; Pirozhkov, A. S.; Fukuda, Yuji; Esirkepov, T. Zh.; Daito, Izuru; Kawase, Keigo; Ma, J. L.*; Chen, L. M.*; Hayashi, Yukio; Mori, Michiaki; et al.
European Physical Journal D, 55(2), p.465 - 474, 2009/09
Times Cited Count：19 Percentile：63.69(Optics)Nonlinear interaction of intense laser beams with plasma causes a number of different regimes of generation of high energy particle beams and of strong radiation with the emitted photon energy from the X-ray to THz frequency range. The review of the first proof-of-principle experiment and the latest progress on the flying mirror is presented. A low frequency EM radiation emission has also been observed in our experiments. The interpretation invokes the relativistic electromagnetic solitons. The solitons are formed in an underdense plasma in the process of the laser pulse frequency downshift. They store a portion of EM wave energy with the polarization inherited from the laser and emit it at the plasma-vacuum interface in a form of the low frequency EM bursts. We present the results of the polarization-resolved measurements.
Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Zh.; Fukuda, Yuji; Chen, L.-M.*; Daito, Izuru; Ogura, Koichi; Homma, Takayuki; Hayashi, Yukio; Kotaki, Hideyuki; et al.
AIP Conference Proceedings 1153, p.274 - 284, 2009/07
Kando, Masaki; Pirozhkov, A. S.; Fukuda, Yuji; Esirkepov, T. Zh.; Daito, Izuru; Kawase, Keigo; Ma, J.-L.; Chen, L.-M.; Hayashi, Yukio; Mori, Michiaki; et al.
Harnessing Relativistic Plasma Waves as Novel Radiation Sources from Terahertz to X-Rays and Beyond (Proceedings of SPIE Vol.7359), p.73590K_1 - 73590K_11, 2009/05
Times Cited Count：0 Percentile：0.00(Optics)Ragozin, E. N.*; Pirozhkov, A. S.; Yogo, Akifumi; Ma, J.-L.; Ogura, Koichi; Orimo, Satoshi; Sagisaka, Akito; Mori, Michiaki; Li, Z.*; Nishiuchi, Mamiko; et al.
Proceedings of 11th Annual Symposium of Nanophysics and Nanoelectronics (Internet), 2 Pages, 2007/03
Kozhevnikov, I. V.*; Voronov, A. S.*; Roshchin, B. S.*; Asadchikov, V. E.*; Mednikov, K. N.*; Pirozhkov, A. S.; Ragozin, E. N.*; Wang, Z.*; Zhong, Z.*; Wang, F.*
Crystallography Reports, 51(6), p.1075 - 1081, 2006/12
Times Cited Count：5 Percentile：47.69(Crystallography)Ragozin, E. N.*; Pirozhkov, A. S.; Yogo, Akifumi; Ma, J.-L.; Ogura, Koichi; Orimo, Satoshi; Sagisaka, Akito; Mori, Michiaki; Li, Z.*; Nishiuchi, Mamiko; et al.
Review of Scientific Instruments, 77(12), p.123302_1 - 123302_6, 2006/12
Times Cited Count：8 Percentile：39.42(Instruments & Instrumentation)Proton acceleration experiments involving a 5m thick Ti foil target irradiation are carried out with the femtosecond Ti:Sapphire laser JLITE-X. The plasma emission at 13.5 nm is recorded employing concave multilayer mirrors, which image the front- and rear-side plasmas onto the sensitive surfaces of a fast X-ray photodiode and a backside-illuminated CCD. Online time-of-flight fast-particle measurements are performed simultaneously with the XUV measurements. A strong correlation is observed between the energetic proton signal and the spatio-temporal behavior of the XUV plasma emission. In particular, the longer duration of the prepulse-produced XUV plasma emission indicates a lowering of the maximum proton energy. This allows using the XUV emission for the diagnostics of the high-intensity laser-solid-target interaction.
Levashov, V. E.*; Mednikov, K. N.*; Pirozhkov, A. S.; Ragozin, E. N.*
Radiation Physics and Chemistry, 75(11), p.1819 - 1823, 2006/11
Times Cited Count：18 Percentile：74.09(Chemistry, Physical)Levashov, V. E.*; Mednikov, K. N.*; Pirozhkov, A. S.; Ragozin, E. N.*
Quantum Electronics, 36(6), p.549 - 552, 2006/06
Times Cited Count：17 Percentile：62.71(Engineering, Electrical & Electronic)Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Pikuz, T. A.; Faenov, A. Ya.*; Ogura, Koichi; Hayashi, Yukio; Kotaki, Hideyuki; Ragozin, E. N.*; Neely, D.*; et al.
no journal, ,
Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Faenov, A. Ya.*; Pikuz, T. A.; Hayashi, Yukio; Kotaki, Hideyuki; Ragozin, E. N.*; Koga, J. K.; Kiriyama, Hiromitsu; et al.
no journal, ,
We discovered a new high-order harmonic generation regime based on relativistic-irradiance (
10
W/cm
) femtosecond lasers interacting with gas jet targets using J-KAREN laser in JAEA and Astra Gemini laser in the CLF, RAL. The comb-like spectra, consisting of several hundred even and odd harmonic orders, are generated by either linearly or circularly polarized pulses. We introduced the new harmonic generation mechanism, where the harmonics are collectively emitted by oscillating electron spikes formed at the joint of the boundaries of a cavity and bow wave created by the relativistically self-focusing laser in underdense plasma. The spike sharpness and stability are explained by catastrophe theory. The mechanism is corroborated by 2D and 3D PIC simulations. We describe recent results including the angular distribution, new experimental data obtained with the J-KAREN laser, and the generation mechanism in more details.
