Diagnostics of laser plasma interaction

Xianfan Xu; H. Kevin Song

doi:10.1117/12.380804

23 March 2000 Diagnostics of laser plasma interaction

Xianfan Xu, H. Kevin Song

Proceedings Volume 3935, Laser Plasma Generation and Diagnostics; (2000) https://doi.org/10.1117/12.380804
Event: Symposium on High-Power Lasers and Applications, 2000, San Jose, CA, United States

Abstract

This paper describes diagnostics experiments of pulsed excimer laser induced plasma. During excimer laser heating, the intense radiation flux from the laser is transformed to the target material and raises the temperature of the target surface rapidly. Melting and evaporation can occur, and the evaporated vapor can be ionized to form a plasma plume. Under rapid heating by a short laser pulse, the melted material can be superheated, and undergoes a phase explosion that turns the melt into a mixture of liquid and vapor. A number of experiments are carried out to investigate the laser-ablated plume. The velocity of the laser-evaporated plasma plume, absorption and scattering of the laser energy by the plasma, the threshold laser fluence for phase explosion, the evaporation pressure at the target surface, and the ablation rate are determined. Experiments are performed in a laser fluence range between 2.5 J/cm² and 10 J/cm² (between 100 MW/cm² and 400 MW/cm²) on nickel specimens. Results of these studies reveal phase change mechanisms and the kinetics at the evaporating surface during excimer laser interaction with the Ni target.

Citation Download Citation

Xianfan Xu and H. Kevin Song "Diagnostics of laser plasma interaction", Proc. SPIE 3935, Laser Plasma Generation and Diagnostics, (23 March 2000); https://doi.org/10.1117/12.380804

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