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Title: Ultrafast Space-time and Spectrum-time Resolved Diagnostics of Multicharged Femtosecond Laser Microplasma

Abstract

We present the review of the recent experimental studies of fundamental mechanisms of femtosecond laser plasma formation and evolution performed in A. M. Prokhorov General Physics Institute of Russian Academy of Sciences. The main object we dealt with was the micro-sized plasma produced in gases with high intensity (up to 5x10{sup 17} W/cm{sup 2}), tightly focused (to a few microns in diameter) IR and UV femtosecond laser pulses. The main attention in the experiments was paid to the initial stage of microplasma formation and evolution characterized by strong laser-plasma coupling resulting in efficient ionization and heating of the medium, distortion of laser beam, and nonlinear spectral conversion of laser radiation to the continuum and laser harmonics. Using a precise pump-probe micro-interferometric technique the dynamics of plasma was studied with femtosecond time-resolution in a wide density range--from a minimal detectable electron concentration (10{sup 19} cm{sup -3}) to the almost total (down to nuclei) ionization of ions occurred under femtosecond excitation. The obtained time-dependences of plasma density were analyzed. It was observed, for the first time, that a characteristic time of femtosecond laser plasma formation in gases considerably (in times) exceeds the duration of the pump laser pulse. This postionization process ismore » attributed to impact ionization of plasma by hot electrons. We compare the results of the experiments with what the developed theory predicts. Using an ultrafast streak-camera-based spectroscopy technique the temporal evolution of microplasma emission and the dynamics of spectral lines formation in UV-visible range were studied with picosecond time-resolution.« less

Authors:
; ; ;  [1]
  1. A. M. Prokhorov General Physics Institute of Russian Academy of Sciences 119991, Vavilov str. 38, Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
21344334
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1153; Journal Issue: 1; Conference: 2. international symposium on laser-driven relativistic plasmas applied to science, industry and medicine, Kyoto (Japan), 19-23 Jan 2009; Other Information: DOI: 10.1063/1.3204548; (c) 2009 American Institute of Physics; Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPARATIVE EVALUATIONS; ELECTRON DENSITY; ELECTRONS; EXCITATION; GASES; HARMONICS; IONIZATION; IONS; LASER RADIATION; LASER-PRODUCED PLASMA; NONLINEAR OPTICS; NONLINEAR PROBLEMS; PLASMA DENSITY; PLASMA DIAGNOSTICS; PLASMA PRODUCTION; STREAK CAMERAS; TIME DEPENDENCE; TIME RESOLUTION; CAMERAS; CHARGED PARTICLES; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; ENERGY-LEVEL TRANSITIONS; EVALUATION; FERMIONS; FLUIDS; LEPTONS; OPTICS; OSCILLATIONS; PLASMA; RADIATIONS; RESOLUTION; TIMING PROPERTIES

Citation Formats

Garnov, S V, Bukin, V V, Malyutin, A A, and Strelkov, V V. Ultrafast Space-time and Spectrum-time Resolved Diagnostics of Multicharged Femtosecond Laser Microplasma. United States: N. p., 2009. Web. doi:10.1063/1.3204548.
Garnov, S V, Bukin, V V, Malyutin, A A, & Strelkov, V V. Ultrafast Space-time and Spectrum-time Resolved Diagnostics of Multicharged Femtosecond Laser Microplasma. United States. https://doi.org/10.1063/1.3204548
Garnov, S V, Bukin, V V, Malyutin, A A, and Strelkov, V V. 2009. "Ultrafast Space-time and Spectrum-time Resolved Diagnostics of Multicharged Femtosecond Laser Microplasma". United States. https://doi.org/10.1063/1.3204548.
@article{osti_21344334,
title = {Ultrafast Space-time and Spectrum-time Resolved Diagnostics of Multicharged Femtosecond Laser Microplasma},
author = {Garnov, S V and Bukin, V V and Malyutin, A A and Strelkov, V V},
abstractNote = {We present the review of the recent experimental studies of fundamental mechanisms of femtosecond laser plasma formation and evolution performed in A. M. Prokhorov General Physics Institute of Russian Academy of Sciences. The main object we dealt with was the micro-sized plasma produced in gases with high intensity (up to 5x10{sup 17} W/cm{sup 2}), tightly focused (to a few microns in diameter) IR and UV femtosecond laser pulses. The main attention in the experiments was paid to the initial stage of microplasma formation and evolution characterized by strong laser-plasma coupling resulting in efficient ionization and heating of the medium, distortion of laser beam, and nonlinear spectral conversion of laser radiation to the continuum and laser harmonics. Using a precise pump-probe micro-interferometric technique the dynamics of plasma was studied with femtosecond time-resolution in a wide density range--from a minimal detectable electron concentration (10{sup 19} cm{sup -3}) to the almost total (down to nuclei) ionization of ions occurred under femtosecond excitation. The obtained time-dependences of plasma density were analyzed. It was observed, for the first time, that a characteristic time of femtosecond laser plasma formation in gases considerably (in times) exceeds the duration of the pump laser pulse. This postionization process is attributed to impact ionization of plasma by hot electrons. We compare the results of the experiments with what the developed theory predicts. Using an ultrafast streak-camera-based spectroscopy technique the temporal evolution of microplasma emission and the dynamics of spectral lines formation in UV-visible range were studied with picosecond time-resolution.},
doi = {10.1063/1.3204548},
url = {https://www.osti.gov/biblio/21344334}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1153,
place = {United States},
year = {Sat Jul 25 00:00:00 EDT 2009},
month = {Sat Jul 25 00:00:00 EDT 2009}
}