Laser plasma emission of small particles in different gas atmospheres

Alexander A. Andreev; Toshitsugu Ueda; Muneaki Wakamatsu

doi:10.1117/12.470648

18 June 2002 Laser plasma emission of small particles in different gas atmospheres

Alexander A. Andreev, Toshitsugu Ueda, Muneaki Wakamatsu

Proceedings Volume 4637, Photon Processing in Microelectronics and Photonics; (2002) https://doi.org/10.1117/12.470648
Event: High-Power Lasers and Applications, 2002, San Jose, California, United States

Abstract

The problem of laser pulse interaction with small solid particles in a gas atmosphere when detecting its parameters is a serous one in industrial and environmental applications. Previous investigations have shown the possibility of using the laser induced breakdown method. This method is very sensitive, but for a particle size of less than 0.1 micrometers the damage threshold of the solid target is very close to the breakdown point of pure gas. At breakdown, a small volume of dense hot plasma emits radiation by which the size and material of particles can be detected. We used an analytical model, simulation code and experiments to analyze this radiation and found that the emitted intensity varied with laser, gas and particle parameters. The increased dependence of SSP plasma emission rate on initial particle volume permits this method to be used for measuring small particle size by using emitted line spectrum at the late time stage.

Citation Download Citation

Alexander A. Andreev, Toshitsugu Ueda, and Muneaki Wakamatsu "Laser plasma emission of small particles in different gas atmospheres", Proc. SPIE 4637, Photon Processing in Microelectronics and Photonics, (18 June 2002); https://doi.org/10.1117/12.470648

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