Laser plasma of poly (methyl methacrylate) in air: modeling and experiment

L. A. Zakharov; N. M. Bulgakova; A. E. Tel'minov; A. N. Panchenko; M. A. Shulepov

doi:10.1117/12.881499

15 November 2010 Laser plasma of poly (methyl methacrylate) in air: modeling and experiment

L. A. Zakharov, N. M. Bulgakova, A. E. Tel'minov, A. N. Panchenko, M. A. Shulepov

Proceedings Volume 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; 77511L (2010) https://doi.org/10.1117/12.881499
Event: 18th International Symposium on Gas Flow and Chemical Lasers and High Power Lasers, 2010, Sofia, Bulgaria

Abstract

Experimental and theoretical studies on laser ablation of polymers (PMMA, polyimide) have been performed in a wide range of CO₂-laser fluences. Evolution of polymer laser plume in air has been investigated with simultaneous registration of radiation spectra of the ablation products, spatial dynamics of plasma flare, and temporal behavior of plasma emission on separate spectral lines. It has been found that spectral lines have intensity peak after laser pulse termination while plasma emission spectra are similar to those of organic material combusting. The results confirm that combustion of the laser-vaporized polymers occurs in the plasma plume. A thermo-chemical model of heating and ablation of organic polymers by CO₂ laser pulses has been developed which takes into account attenuation of radiation in laser plasmas and chemical processes leading to heating the plume of the ablation products. Temperature evolution in the irradiated sample, ablation dynamics, and laser beam attenuation are analyzed. The modeling results are compared with the experimental data on high-speed imaging of the plasma plume. The effect of the formation of a "plasma pipe" is revealed under polymer ablation in air under normal conditions.

Citation Download Citation

L. A. Zakharov, N. M. Bulgakova, A. E. Tel'minov, A. N. Panchenko, and M. A. Shulepov "Laser plasma of poly (methyl methacrylate) in air: modeling and experiment", Proc. SPIE 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 77511L (15 November 2010); https://doi.org/10.1117/12.881499

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KEYWORDS

Plasma

Laser ablation

Polymers

Polymethylmethacrylate

Carbon dioxide lasers

Pulsed laser operation

Combustion

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