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

M. A. Alkhimova, A. Ya Faenov, I. Y.U. Skobelev, T. A. Pikuz, M. Nishiuchi, H. Sakaki, A. S. Pirozhkov, A. Sagisaka, N. P. Dover, K. O. Kondo, K. Ogura, Y. Fukuda, H. Kiriyama, K. Nishitani, T. Miyahara, Y. Watanabe, S. A. Pikuz, M. Kando, R. Kodama, And K. Kondo

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

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 × 1021 W/cm2). Kinetic modelling was used to estimate electron plasma density and temperature, demonstrating Te ~2.1 keV for Ne ~5 × 1022 cm−3 in the hottest emission region. Thus, it is experimentally demonstrated for the first time that the laser pulse of over 1021 W/cm2 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.

Original languageEnglish
Pages (from-to)29501-29511
Number of pages11
JournalOptics Express
Volume25
Issue number23
DOIs
Publication statusPublished - Nov 13 2017

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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