Laser beat wave excitation of surface plasma wave and material ablation
- Laser Science and Technology Centre, Metcalfe House, Delhi-110054 (India)
Two coplanar laser beams of frequencies {omega}{sub 1} and {omega}{sub 2}, impinged on a metal surface at angles of incidence {theta} and -{theta}, resonantly excite a surface plasma wave (SPW) at the difference frequency {omega}={omega}{sub 1}-{omega}{sub 2} when {omega} has a specific value {omega}={omega}{sub R}({theta}), where {omega}{sub R} depends on {omega}{sub 1},{omega}{sub 2},{theta} and plasma frequency of the metal. The lasers exert a ponderomotive force on electrons in the skin layer and drive the SPW. The latter heats the electrons efficiently, causing efficient ablation of the material. The reduction in laser pulse lengths results in reducing the efficiency of SPW excitation and ablation.
- OSTI ID:
- 21062046
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 10 Vol. 14; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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