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Title: The effect of laser wavelength on laser-induced carbon plasma

The effect of laser wavelength on parameters of laser-ablated carbon plume is studied. A theoretical model is applied, which describes the target heating and formation of the plasma and its expansion, and calculations are made for the fundamental and third harmonic of a Nd:YAG laser. The calculated distributions of plasma temperature and electron density in the early phase of expansion show that plasma temperatures are higher in the case of 1064 nm but the electron densities are higher in the case of 355 nm, which is in agreement with experimental findings. It has been shown that while a higher plasma temperature in the case of 1064 nm is the result of stronger plasma absorption, the greater ablation rate in the case of 355 nm results in larger mass density of the ablated plume and hence, in higher electron densities. An additional consequence of a higher ablation rate is slower expansion and smaller dimensions of the plume.
Authors:
; ;  [1]
  1. Institute of Fundamental Technological Research, Pawinskiego 5B, 02-106 Warsaw (Poland)
Publication Date:
OSTI Identifier:
22218093
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABLATION; CARBON; ELECTRON DENSITY; ELECTRON TEMPERATURE; HARMONIC GENERATION; ION TEMPERATURE; NEODYMIUM LASERS; PLASMA DENSITY; PLASMA DIAGNOSTICS; PLASMA HEATING; PLASMA PRODUCTION; WAVELENGTHS