Abstract
Language | English |
---|---|
Article number | 093003 |
Number of pages | 30 |
Journal | New Journal of Physics |
Volume | 16 |
DOIs | |
Publication status | Published - Sep 2014 |
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Keywords
- relativistic laser plasma
- high-order harmonics
- elativistic electron spikes
- gas jet target
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High order harmonics from relativistic electron spikes. / Pirozhkov, Alexander; Kando, Masaki; Esirkepov, Timur; Gallegos, Pablo; Ahmed, Hamad; Ragozin, Eugene; Pikuz, Tatiana; Kawachi, Tetsuya; Sagisaka, Akito; Koga, James; Coury, Mireille; Green, J.; Foster, P.S.; Brenner, Ceri Mae; Symes, Dan; Mori, Michiaki; Kawase, Keigo; Kameshima, Takashi; Fukuda, Yuji; Chen, Liming; Daito, Izuru; Ogura, Koichi; Hayashi, Yukio; Kotaki, Hideyuki; Kiriyama, Hiromitsu; Okada, Hajime; Nishimori, Nobuyuki; Imazono, Takashi; Kondo, Kiminori; Tajima, Toshiki; Daido, Hiroyuki; Pattahil, Rajeev; McKenna, Paul; Borghesi, Marco; Neely, David; Kato, Yoshiaki; Bulanov, Sergei.
In: New Journal of Physics, Vol. 16, 093003, 09.2014.Research output: Contribution to journal › Article
TY - JOUR
T1 - High order harmonics from relativistic electron spikes
AU - Pirozhkov, Alexander
AU - Kando, Masaki
AU - Esirkepov, Timur
AU - Gallegos, Pablo
AU - Ahmed, Hamad
AU - Ragozin, Eugene
AU - Pikuz, Tatiana
AU - Kawachi, Tetsuya
AU - Sagisaka, Akito
AU - Koga, James
AU - Coury, Mireille
AU - Green, J.
AU - Foster, P.S.
AU - Brenner, Ceri Mae
AU - Symes, Dan
AU - Mori, Michiaki
AU - Kawase, Keigo
AU - Kameshima, Takashi
AU - Fukuda, Yuji
AU - Chen, Liming
AU - Daito, Izuru
AU - Ogura, Koichi
AU - Hayashi, Yukio
AU - Kotaki, Hideyuki
AU - Kiriyama, Hiromitsu
AU - Okada, Hajime
AU - Nishimori, Nobuyuki
AU - Imazono, Takashi
AU - Kondo, Kiminori
AU - Tajima, Toshiki
AU - Daido, Hiroyuki
AU - Pattahil, Rajeev
AU - McKenna, Paul
AU - Borghesi, Marco
AU - Neely, David
AU - Kato, Yoshiaki
AU - Bulanov, Sergei
PY - 2014/9
Y1 - 2014/9
N2 - A new regime of relativistic high-order harmonic generation is discovered [Phys. Rev. Lett. 108, 135004 (2012)]. Multi-terawatt relativistic-irradiance (>1018 W/cm2) femtosecond (~30-50 fs) lasers focused to underdense (few×1019 cm-3) plasma formed in gas jet targets produce comb-like spectra with hundreds of even and odd harmonic orders reaching the photon energy of 360 eV, including the 'water window' spectral range. Harmonics are generated by either linearly or circularly polarized pulses from the J-KAREN (KPSI, JAEA) and Astra Gemini (CLF, RAL, UK) lasers. The photon number scalability has been demonstrated with a 120 TW laser producing 40 μJ/sr per harmonic at 120 eV. The experimental results are explained using particle-in-cell (PIC) simulations and catastrophe theory. A new mechanism of harmonic generation by sharp, structurally stable, oscillating electron spikes at the joint of boundaries of wake and bow waves excited by a laser pulse is introduced. In this paper detailed descriptions of the experiments, simulations and model are provided and new features are shown, including data obtained with a two-channel spectrograph, harmonic generation by circularly polarized laser pulses and angular distribution.
AB - A new regime of relativistic high-order harmonic generation is discovered [Phys. Rev. Lett. 108, 135004 (2012)]. Multi-terawatt relativistic-irradiance (>1018 W/cm2) femtosecond (~30-50 fs) lasers focused to underdense (few×1019 cm-3) plasma formed in gas jet targets produce comb-like spectra with hundreds of even and odd harmonic orders reaching the photon energy of 360 eV, including the 'water window' spectral range. Harmonics are generated by either linearly or circularly polarized pulses from the J-KAREN (KPSI, JAEA) and Astra Gemini (CLF, RAL, UK) lasers. The photon number scalability has been demonstrated with a 120 TW laser producing 40 μJ/sr per harmonic at 120 eV. The experimental results are explained using particle-in-cell (PIC) simulations and catastrophe theory. A new mechanism of harmonic generation by sharp, structurally stable, oscillating electron spikes at the joint of boundaries of wake and bow waves excited by a laser pulse is introduced. In this paper detailed descriptions of the experiments, simulations and model are provided and new features are shown, including data obtained with a two-channel spectrograph, harmonic generation by circularly polarized laser pulses and angular distribution.
KW - relativistic laser plasma
KW - high-order harmonics
KW - elativistic electron spikes
KW - gas jet target
UR - http://iopscience.iop.org/1367-2630/
U2 - 10.1088/1367-2630/16/9/093003
DO - 10.1088/1367-2630/16/9/093003
M3 - Article
VL - 16
JO - New Journal of Physics
T2 - New Journal of Physics
JF - New Journal of Physics
SN - 1367-2630
M1 - 093003
ER -