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Journal Articles

High order harmonics from relativistic electron spikes

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

Journal Articles

High order harmonics from relativistic electron spikes

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:22 Percentile:20.08(Physics, Multidisciplinary)

Journal Articles

Relativistic high harmonic generation in gas jet targets

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A. Ya.*; Pikuz, T.; Kawachi, Tetsuya; Sagisaka, Akito; et al.

AIP Conference Proceedings 1465, p.167 - 171, 2012/07

 Times Cited Count:1 Percentile:48.59

Journal Articles

High-order harmonics from bow wave caustics driven by a high-intensity laser

Esirkepov, T. Z.; Pirozhkov, A. S.; Kando, Masaki; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A.*; Pikuz, T.; Kawachi, Tetsuya; Sagisaka, Akito; et al.

AIP Conference Proceedings 1465, p.172 - 180, 2012/07

 Times Cited Count:0 Percentile:100

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.

Journal Articles

X-ray emission from relativistically moving electron density cusps

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:100

Journal Articles

Soft-X-ray harmonic comb from relativistic electron spikes

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A. Ya.*; Pikuz, T.; Kawachi, Tetsuya; Sagisaka, Akito; et al.

Physical Review Letters, 108(13), p.135004_1 - 135004_5, 2012/03

 Times Cited Count:59 Percentile:8.18(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 $$mu$$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.

Journal Articles

Coherent X-ray generation in relativistic laser - gas jet interactions

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A. Ya.*; Pikuz, T.; Koga, J. K.; Kiriyama, Hiromitsu; et al.

Proceedings of SPIE, Vol.8140, p.81400A_1 - 81400A_16, 2011/10

Journal Articles

Method of observing the spot where full-power counter-propagating laser pulses collide in plasma media

Kawase, Keigo; Kando, Masaki; Pirozhkov, A. S.; Homma, Takayuki; Kameshima, Takashi*; Daito, Izuru; Hayashi, Yukio; Kotaki, Hideyuki; Fukuda, Yuji; Esirkepov, T. Z.; et al.

Applied Physics Express, 3, p.016101_1 - 016101_3, 2010/01

 Times Cited Count:2 Percentile:88.08(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 $$mu{rm m}$$ with the precision level of alignment better than 15 $$mu{rm m}$$ even when there is plasma present.

Journal Articles

Enhancement of photon number reflected by the relativistic flying mirror

Kando, Masaki; Pirozhkov, A. S.; Kawase, Keigo; Esirkepov, T. Z.; 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:78 Percentile:6.78(Physics, Multidisciplinary)

Journal Articles

Experimental studies of the high and low frequency electromagnetic radiation produced from nonlinear laser-plasma interactions

Kando, Masaki; Pirozhkov, A. S.; Fukuda, Yuji; Esirkepov, T. Z.; 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:17 Percentile:33.4(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.

Journal Articles

Demonstration of flying mirror with improved efficiency

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; 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

Journal Articles

XUV diagnostics of preformed plasma in laser-driven proton acceleration experiments

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

Journal Articles

Design, fabrication, and study of wideband multilayer X-ray mirrors

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:48.71(Crystallography)

Journal Articles

Extreme ultraviolet diagnostics of preformed plasma in laser-driven proton acceleration experiments

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:56.01(Instruments & Instrumentation)

Proton acceleration experiments involving a 5$$mu$$m 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.

Journal Articles

Aperiodic X-ray multilayer mirrors and their application in plasma spectroscopy

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:16 Percentile:23.34(Chemistry, Physical)

Journal Articles

Optimisation of a laser-plasma soft X-ray source excited in a pulsed xenon jet

Levashov, V. E.*; Mednikov, K. N.*; Pirozhkov, A. S.; Ragozin, E. N.*

Quantum Electronics, 36(6), p.549 - 552, 2006/06

 Times Cited Count:14 Percentile:38.43(Engineering, Electrical & Electronic)

Oral presentation

Laser wake wave as a relativistic flying mirror

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Ma, J.*; Fukuda, Yuji; Chen, L. M.*; Daito, Izuru; Ogura, Koichi; Homma, Takayuki; Hayashi, Yukio; et al.

no journal, , 

Oral presentation

Reflection and frequency upshifting from electron density modulations produced by laser-plasma interaction; Towards the realization of attosecond, coherent X-ray source

Kando, Masaki; Fukuda, Yuji; Pirozhkov, A. S.; Ma, J.*; Chen, L.*; Esirkepov, T. Z.; Ogura, Koichi; Homma, Takayuki; Hayashi, Yukio; Bulanov, S. V.; et al.

no journal, , 

We present a nobel method which can make it possible to generate attosecond, intense, coherent X-ray pulses. This method utilizes plasma electron modulation which is driven in an underdense plasma by an intense ultra-short laser pulse. The breaking wake wave works as a partially reflecting mirror (flying mirror) for incoming laser pulse. The reflected pulse is up-shifted in frequency and compressed in time by Doppler effect and inherits the coherence from the initial laser pulse. We show the proof-of-principle of the flying mirror concept and discuss the possibility of the future X-ray source.

Oral presentation

New mechanism of harmonic generation in relativistic plasma

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Ragozin, E. N.*; Faenov, A. Y.; Pikuz, T. A.*; Koga, J. K.; Kawase, Keigo; Kameshima, Takashi*; Ma, J.*; et al.

no journal, , 

Oral presentation

XUV light generation with relativistic flying mirror via counter-propagating laser pulses, 1

Kawase, Keigo; Kando, Masaki; Pirozhkov, A. S.; Homma, Takayuki; Kameshima, Takashi*; Daito, Izuru; Hayashi, Yukio; Kotaki, Hideyuki; Fukuda, Yuji; Esirkepov, T. Z.; et al.

no journal, , 

Relativistic flying mirror experiment is performed by using a high-intense Ti:Sapphire laser with the energy of 520 mJ and the pulse duration of 30 fs at KPSI-JAEA. In this experiment, we observe the generation of XUV lights, and it intensity is in good agreement with the theoretical estimation. We will report the abstract of this study and the detail of the experimental procedure in this meeting.

39 (Records 1-20 displayed on this page)