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Proceedings Paper

Experimental studies of optical phenomena in laser-induced low-temperature plasma
Author(s): Vladimir N. Anisimov; Vladimir Yu. Baranov; Oleg N. Derkach; Vladimir A. Dolgov; Mikhail F. Kanevskii; Dmitrii D. Malyuta; Andrey Yu. Sebrant; Maria A. Stepanova
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Paper Abstract

The results described in the paper clearly show that a plasma plume produced under conditions typical for laser-assisted materials treatment has a complicated spatial and temporal structure. Numerous 2D processes affected the beam propagation through the plasma leading to spatial and temporal energy redistribution on the target surface which affects both efficiency and quality of material processing at intensity level in the range from 107 to 1010 W/cm2. It is also demonstrated that the `target-plasma-laser' feedback arising during laser processing of metal targets can disturb temporal distribution in the incident laser pulse causing output power modulations at several MHz with perturbation depth more than 50%. The feedback effect proves to be responsible for spatial and temporal distribution of the radiation on the target surface and affects laser beam quality, dynamics, and optical properties of low-threshold low-temperature breakdown plasma with the electron density ranging from 1017 to 1019 cm-3. Experiments were carried out in a wide range of parameters using microsecond pulses of CO2 and XeCl lasers. Diagnostics used in the experiments provide appropriate spatial and temporal resolution (0.1 mm and 10 ns, respectively). Adequate modeling, self-consistent or combined, is applied to explain and interpret experimental data.

Paper Details

Date Published: 1 June 1994
PDF: 12 pages
Proc. SPIE 2119, Intense Beams and Applications: Lasers, Ions, and Microwaves, (1 June 1994); doi: 10.1117/12.172719
Show Author Affiliations
Vladimir N. Anisimov, Troitsk Kurchatov Research Institute (Russia)
Vladimir Yu. Baranov, Troitsk Kurchatov Research Institute (Russia)
Oleg N. Derkach, Troitsk Kurchatov Research Institute (Russia)
Vladimir A. Dolgov, Troitsk Kurchatov Research Institute (Russia)
Mikhail F. Kanevskii, Troitsk Kurchatov Research Institute (Russia)
Dmitrii D. Malyuta, Troitsk Kurchatov Research Institute (Russia)
Andrey Yu. Sebrant, Troitsk Kurchatov Research Institute (Russia)
Maria A. Stepanova, Troitsk Kurchatov Research Institute (Russia)

Published in SPIE Proceedings Vol. 2119:
Intense Beams and Applications: Lasers, Ions, and Microwaves
William E. McDermott, Editor(s)

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