High order harmonics from relativistic electron spikes

Alexander Pirozhkov; Masaki Kando; Timur Esirkepov; Pablo Gallegos; Hamad Ahmed; Eugene Ragozin; Tatiana Pikuz; Tetsuya Kawachi; Akito Sagisaka; James Koga; Mireille Coury; J. Green; P.S. Foster; Ceri Mae Brenner; Dan Symes; Michiaki Mori; Keigo Kawase; Takashi Kameshima; Yuji Fukuda; Liming Chen; Izuru Daito; Koichi Ogura; Yukio Hayashi; Hideyuki Kotaki; Hiromitsu Kiriyama; Hajime Okada; Nobuyuki Nishimori; Takashi Imazono; Kiminori Kondo; Toshiki Tajima; Hiroyuki Daido; Rajeev Pattahil; Paul McKenna; Marco Borghesi; David Neely; Yoshiaki Kato; Sergei Bulanov

doi:10.1088/1367-2630/16/9/093003

High order harmonics from relativistic electron spikes

Alexander Pirozhkov, Masaki Kando, Timur Esirkepov, Pablo Gallegos, Hamad Ahmed, Eugene Ragozin, Tatiana Pikuz, Tetsuya Kawachi, Akito Sagisaka, James Koga, Mireille Coury, J. Green, P.S. Foster, Ceri Mae Brenner, Dan Symes, Michiaki Mori, Keigo Kawase, Takashi Kameshima, Yuji Fukuda, Liming ChenIzuru Daito, Koichi Ogura, Yukio Hayashi, Hideyuki Kotaki, Hiromitsu Kiriyama, Hajime Okada, Nobuyuki Nishimori, Takashi Imazono, Kiminori Kondo, Toshiki Tajima, Hiroyuki Daido, Rajeev Pattahil, Paul McKenna, Marco Borghesi, David Neely, Yoshiaki Kato, Sergei Bulanov

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Abstract

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.

Original language	English
Article number	093003
Number of pages	30
Journal	New Journal of Physics
Volume	16
DOIs	https://doi.org/10.1088/1367-2630/16/9/093003
Publication status	Published - Sept 2014

Keywords

relativistic laser plasma
high-order harmonics
elativistic electron spikes
gas jet target

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10.1088/1367-2630/16/9/093003

Pirozhkov-etal-NJP2014-high-order-harmonics-from-relativistic-electron-spikesFinal published version, 4.95 MBLicence: CC BY 4.0

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Pirozhkov, A., Kando, M., Esirkepov, T., Gallegos, P., Ahmed, H., Ragozin, E., Pikuz, T., Kawachi, T., Sagisaka, A., Koga, J., Coury, M., Green, J., Foster, P. S., Brenner, C. M., Symes, D., Mori, M., Kawase, K., Kameshima, T., Fukuda, Y., ... Bulanov, S. (2014). High order harmonics from relativistic electron spikes. New Journal of Physics, 16, Article 093003. https://doi.org/10.1088/1367-2630/16/9/093003

@article{681e5e8be06a4e649bceb2b0c9b308b6,

title = "High order harmonics from relativistic electron spikes",

abstract = "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.",

keywords = "relativistic laser plasma, high-order harmonics, elativistic electron spikes, gas jet target",

author = "Alexander Pirozhkov and Masaki Kando and Timur Esirkepov and Pablo Gallegos and Hamad Ahmed and Eugene Ragozin and Tatiana Pikuz and Tetsuya Kawachi and Akito Sagisaka and James Koga and Mireille Coury and J. Green and P.S. Foster and Brenner, {Ceri Mae} and Dan Symes and Michiaki Mori and Keigo Kawase and Takashi Kameshima and Yuji Fukuda and Liming Chen and Izuru Daito and Koichi Ogura and Yukio Hayashi and Hideyuki Kotaki and Hiromitsu Kiriyama and Hajime Okada and Nobuyuki Nishimori and Takashi Imazono and Kiminori Kondo and Toshiki Tajima and Hiroyuki Daido and Rajeev Pattahil and Paul McKenna and Marco Borghesi and David Neely and Yoshiaki Kato and Sergei Bulanov",

year = "2014",

month = sep,

doi = "10.1088/1367-2630/16/9/093003",

language = "English",

volume = "16",

journal = "New Journal of Physics",

issn = "1367-2630",

}

Pirozhkov, A, Kando, M, Esirkepov, T, Gallegos, P, Ahmed, H, Ragozin, E, Pikuz, T, Kawachi, T, Sagisaka, A, Koga, J, Coury, M, Green, J, Foster, PS, Brenner, CM, Symes, D, Mori, M, Kawase, K, Kameshima, T, Fukuda, Y, Chen, L, Daito, I, Ogura, K, Hayashi, Y, Kotaki, H, Kiriyama, H, Okada, H, Nishimori, N, Imazono, T, Kondo, K, Tajima, T, Daido, H, Pattahil, R, McKenna, P, Borghesi, M, Neely, D, Kato, Y & Bulanov, S 2014, 'High order harmonics from relativistic electron spikes', New Journal of Physics, vol. 16, 093003. https://doi.org/10.1088/1367-2630/16/9/093003

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

SN - 1367-2630

VL - 16

JO - New Journal of Physics

JF - New Journal of Physics

M1 - 093003

ER -

High order harmonics from relativistic electron spikes

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