High order harmonics from relativistic electron spikes

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	High order harmonics from relativistic electron spikes
	Pirozhkov, AS ; Kando, M ; Esirkepov, TZ ; Gallegos, P ; Ahmed, H ; Ragozin, EN ; Faenov, AY ; Pikuz, TA ; Kawachi, T ; Sagisaka, A ; Koga, JK ; Coury, M ; Green, J ; Foster, P ; Brenner, C ; Dromey, B ; Symes, DR ; Mori, M ; Kawase, K ; Kameshima, T ; Fukuda, Y ; Chen, LM ; Daito, I ; Ogura, K ; Hayashi, Y ; Kotaki, H ; Kiriyama, H ; Okada, H ; Nishimori, N ; Imazono, T ; Kondo, K ; Kimura, T ; Tajima, T ; Daido, H ; Rajeev, P ; McKenna, P ; Borghesi, M ; Neely, D ; Kato, Y ; Bulanov, SV
刊名	NEW JOURNAL OF PHYSICS
	2014
卷号	16
关键词	relativistic laser plasma high-order harmonics relativistic electron spikes gas jet target
ISSN号	1367-2630
通讯作者	Pirozhkov, AS (reprint author), Japan Atom Energy Agcy, Kansai Photon Sci Inst, 8-1-7 Umemidai, Kizugawa City, Kyoto 6190215, Japan.
中文摘要	A new regime of relativistic high-order harmonic generation has been discovered (Pirozhkov 2012 Phys. Rev. Lett. 108 135004). Multi-terawatt relativistic-irradiance (>10(18) Wcm(-2)) femtosecond (similar to 30-50 fs) lasers focused to underdense (few x 10(19) 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 either by 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 mu J sr(-1) per harmonic at 120 eV. The experimental results are explained using particle-in-cell simulations and catastrophe theory. A new mechanism of harmonic generation by sharp, structurally stable, oscillating electron spikes at the joint of the boundaries of the 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.
资助信息	MEXT, Japan (Kakenhi) [20244065, 21604008, 21740302, 23740413, 25287103, 25390135, 26707031]; JAEA Research and Development Adjustment Funding for Exploratory Research; STFC facility access fund (UK); RFBR-JSPS collaboration program, Russia and Japan (RFBR) [14-02-92107]; Presidium of the RAS, Russia [2]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59400]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Pirozhkov, AS,Kando, M,Esirkepov, TZ,et al. High order harmonics from relativistic electron spikes[J]. NEW JOURNAL OF PHYSICS,2014,16.
APA	Pirozhkov, AS.,Kando, M.,Esirkepov, TZ.,Gallegos, P.,Ahmed, H.,...&Bulanov, SV.(2014).High order harmonics from relativistic electron spikes.NEW JOURNAL OF PHYSICS,16.
MLA	Pirozhkov, AS,et al."High order harmonics from relativistic electron spikes".NEW JOURNAL OF PHYSICS 16(2014).