Effect of Laser Energy and Atmosphere on the Emission Characteristics of Laser-Induced Plasmas

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Abstract:

The effects of laser energy and atmosphere on the emission characteristics of laser-induced plasmas were studied with the use of a Q-switched Nd:YAG laser over a laser energy range of 20 to 95 mJ. Argon, helium, and air were used as surrounding atmospheres, and the pressures were changed from atmospheric pressure to 1 Torr. The experimental results showed that the maximum spectral intensity was obtained in argon at around 200 Torr at a high laser energy of 95 mJ, whereas the line-to-background ratio was maximized in helium at around 40 Torr at a low energy of 20 mJ. The results are discussed briefly on the basis of the temporal and spatial observations of the laser-induced plasmas.

Keywords: Atmosphere; Background; Emission intensity; Laser energy; Laser-induced plasma; Line-to-background ratio

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702934334804

Affiliations: Department of Electronic Engineering, College of Engineering, Chubu University, 1200 Matsumoto-cho, Kasugai-shi, Aichi 487, Japan

Publication date: October 1, 1993

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