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 language | English |
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Pages (from-to) | 29501-29511 |
Number of pages | 11 |
Journal | Optics Express |
Volume | 25 |
Issue number | 23 |
DOIs | |
Publication status | Published - Nov 13 2017 |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics