Experimental studies of optical phenomena in laser-induced low-temperature plasma

Vladimir N. Anisimov; Vladimir Yu. Baranov; Oleg N. Derkach; Vladimir A. Dolgov; Mikhail F. Kanevskii; Dmitrii D. Malyuta; Andrey Yu. Sebrant; Maria A. Stepanova

doi:10.1117/12.172719

1 June 1994 Experimental studies of optical phenomena in laser-induced low-temperature plasma

Vladimir N. Anisimov, Vladimir Yu. Baranov, Oleg N. Derkach, Vladimir A. Dolgov, Mikhail F. Kanevskii, Dmitrii D. Malyuta, Andrey Yu. Sebrant, Maria A. Stepanova

Author Affiliations +

Proceedings Volume 2119, Intense Beams and Applications: Lasers, Ions, and Microwaves; (1994) https://doi.org/10.1117/12.172719
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

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.

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Vladimir N. Anisimov, Vladimir Yu. Baranov, Oleg N. Derkach, Vladimir A. Dolgov, Mikhail F. Kanevskii, Dmitrii D. Malyuta, Andrey Yu. Sebrant, and Maria A. Stepanova "Experimental studies of optical phenomena in laser-induced low-temperature plasma", Proc. SPIE 2119, Intense Beams and Applications: Lasers, Ions, and Microwaves, (1 June 1994); https://doi.org/10.1117/12.172719

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KEYWORDS

Plasma

Modulation

Carbon dioxide lasers

Refraction

Absorption

Laser beam propagation

Pulsed laser operation

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