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-ray sourceEsirkepov, T. Z.; Bulanov, S. V.; 神門 正城; Pirozhkov, A. S.; Zhidkov, A. G.*
Harnessing Relativistic Plasma Waves as Novel Radiation Sources from Terahertz to X-Rays and Beyond (Proceedings of SPIE Vol.7359), p.735909_1 - 735909_11, 2009/06
被引用回数：1 パーセンタイル：66.00(Optics)An ultra-bright high-power X-ray and -ray source is proposed. A relativistic flying mirror reflects a counter-propagating electromagnetic radiation causing its frequency multiplication and intensification, while the role of the mirror is played by a solid-density thin plasma slab accelerating in the radiation pressure dominant regime. Frequencies of high harmonics generated at the flying mirror by a relativistically strong counter-propagating radiation undergo multiplication with the same factor as the fundamental frequency of the reflected radiation, approximately equal to the quadruple of the square of the mirror Lorentz factor. The theory of the reflectivity of a moving thin plasma slab is presented.
神門 正城; Pirozhkov, A. S.; 福田 祐仁; Esirkepov, T. Z.; 大東 出; 川瀬 啓悟; Ma, J.-L.; Chen, L.-M.; 林 由紀雄; 森 道昭; et al.
Harnessing Relativistic Plasma Waves as Novel Radiation Sources from Terahertz to X-Rays and Beyond (Proceedings of SPIE Vol.7359), p.73590K_1 - 73590K_11, 2009/05
被引用回数：0 パーセンタイル：0.00(Optics)Electromagnetic wave generation at the extreme ultraviolet (XUV) and infrared (IR) wavelength range is described through the interaction of intense short laser pulses with underdense plasmas. XUV pulses are generated through a laser light reflection from a relativistically moving electron dense shells (flying mirrors). A proof-of-principle and an advanced experiment of flying mirrors are presented. Both of the experiments demonstrated light reflection and frequency upshift in the XUV wavelength range (14-20 nm). The advanced experiment with a head-on collision of two laser pulses exhibited the high reflected photon number. IR radiation, which is observed in the forward direction, has the wavelength of 5 
m and the same polarization as the driving laser dominantly. The source of the IR radiation is attributed to emission from relativistic solitons formed in underdense plasma.
Pirozhkov, A. S.; 神門 正城; Esirkepov, T. Z.; Ragozin, E. N.*; Faenov, A. Y.; Pikuz, T. A.*; Koga, J. K.; 川瀬 啓悟; 亀島 敬*; Ma, J.*; et al.
no journal, ,
We present experimental results, theory, and particle-in-cell simulations in which new mechanism of harmonic generation in the interaction of relativistic laser with plasma waves is demonstrated. In the experiment using 9 TW, 27 fs, 820 nm pulses we observed resolved harmonics with wavelength down to 7 nm (harmonic order 
110) and unresolved down to 4 nm (harmonic order 200). Both odd and even harmonics with similar intensity were observed. The obtained results can be used as a laser-plasma interaction diagnostic tool and may eventually open way to a new convenient coherent X-ray source.
