High resolution X-ray spectra of stainless steel foils irradiated by femtosecond laser pulses with ultra-relativistic intensities

We report on the spectra of x-rays emitted from dense plasma generated via irradiation of thin stainless steel foils by ultra-relativistic femtosecond laser pulses (intensities ~3 × 10^21 W/cm^2). Kinetic modelling was used to estimate electron plasma density and temperature, demonstrating Te ~2.1 keV for Ne ~5 × 10^22 cm^−3 in the hottest emission region. Thus, it is experimentally demonstrated for the first time that the laser pulse of over 10^21 W/cm^2 intensity is absorbed neither in the solid density plasma nor in a pre-plasma of a common critical density, but in the matter of so called relativistic critical density.

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Optics Express

巻 25, 号 23, p. 29501-29511, 発行日 2017-11

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High resolution X-ray spectra of stainless steel foils irradiated by femtosecond laser pulses with ultra-relativistic intensities

× A. Alkhimova, M.

× Ya. Faenov, A.

× Yu. Skobelev, I.

× A. Pikuz, T.

× 西内, 満美子

× 榊, 泰直

× ピロジコフ, アレキサンダー

× 匂坂, 明人

× ドーバー, ニコラス ピーター

× 近藤, 康太郎

× 小倉, 浩一

× 福田, 祐仁

× 桐山, 博光

× 西谷, 勁太

× 宮原, 巧

× 渡辺, 幸信

× A. Pikuz, S.

× 神門, 正城

× 兒玉, 了祐

× 近藤, 公伯

× Nishiuchi, Mamiko

× Sakaki, Hironao

× Pirozhkov, Alexander

× Sagisaka, Akito

× Dover, NicholasPeter

× Kondo, Kotaro

× Ogura, Koichi

× Fukuda, Yuuji

× Kiriyama, Hiromitsu

× Nishitani, Keita

× Miyahara, Takumi

× Watanabe, Yukinobu

× Kando, Masaki

× Kodama, Ryousuke

× Kondo, Kiminori

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× ドーバー, ニコラスピーター