Boosted high-harmonics pulse from a double-sided relativistic mirror.

Kansai Photon Science Institute, JAEA, Kizugawa, Kyoto 619-0215, Japan.
Physical Review Letters (Impact Factor: 7.73). 08/2009; 103(2):025002. DOI: 10.1103/PhysRevLett.103.025002
Source: PubMed

ABSTRACT An ultrabright high-power x- and gamma-radiation source is proposed. A high-density thin plasma slab, accelerating in the radiation pressure dominant regime by an ultraintense electromagnetic wave, reflects a counterpropagating relativistically strong electromagnetic wave, producing extremely time-compressed and intensified radiation. The reflected light contains relativistic harmonics generated at the plasma slab, all upshifted with the same factor as the fundamental mode of the incident light. The theory of an arbitrarily moving thin plasma slab reflectivity is presented.

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    ABSTRACT: 5 The dynamics of a solid foil irradiated by a circularly polarized laser pulse in the normal incidence is investi-6 gated by performing particle-in-cell simulations. After sufficiently compressed by the light pressure, the foil 7 becomes transparent, with a part of the incident pulse transmitted through, and then it turns opaque again, 8 blocking the tail of the pulse. It is found that the transparency dynamically depends on the motion of the 9 compressed foil, and relies on the incident pulse. Thus the foil can be used to shorten the incident pulse as a 10 self-triggered shutter.
    Physics of Plasmas 01/2010; 79. · 2.38 Impact Factor
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    ABSTRACT: When an intense femtosecond laser pulse hits an optically polished surface, it generates a dense plasma that itself acts as a mirror, known as the plasma mirror. As this mirror reflects the high-intensity laser field, its nonlinear temporal response can lead to a periodic temporal distortion of the reflected wave, associated with a train of attosecond light pulses, and, in the frequency domain, to the generation of high-order harmonics of the laser. This tutorial presents detailed theoretical and numerical analysis of the two dominant harmonic generation mechanisms identified so far, coherent wake emission and the relativistic oscillating mirror. Parametric studies of the emission efficiency are presented for these two regimes, and the phase properties of the corresponding harmonics are discussed. This theoretical study is complemented by a synthesis of recent experimental results, which establishes that these two mechanisms indeed dominate harmonic generation on plasma mirrors.
    Journal of Physics B Atomic Molecular and Optical Physics 01/2010; 43(21). · 2.03 Impact Factor
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    ABSTRACT: We report on the realistic scheme of intense X-rays and gamma-radiation generation in a laser interaction with thin foils. It is based on the relativistic mirror concept, i.e., a flying thin plasma slab interacts with a counterpropagating laser pulse, reflecting part of it in the form of an intense ultra-short electromagnetic pulse having an up-shifted frequency. A series of relativistic mirrors is generated in the interaction of the intense laser with a thin foil target as the pulse tears off and accelerates thin electron layers. A counterpropagating pulse is reflected by these flying layers in the form of a swarm of ultra-short pulses resulting in a significant energy gain of the reflected radiation due to the momentum transfer from flying layers.
    Journal of Physics Conference Series 01/2010; 244(2).

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