Temporal and spatial evolution of the electronic density and temperature of the plasma produced by laser ablation of LiNbO[sub 3]

Gordillo-Vázquez, F. J.; Perea, A.; Chaos, J. A.; Gonzalo, J.; Afonso, C. N.
January 2001
Applied Physics Letters;1/1/2001, Vol. 78 Issue 1, p7
Academic Journal
Emission spectroscopy is used to determine the spatial and temporal evolution of the electronic temperature (T[sub e]) and density (N[sub e]) of the plasma generated by laser ablation in vacuum of a LiNbO[sub 3] target. It is found that whereas N[sub e] (in the range of 10[sup 16] cm[sup -3]) decreases by a factor of 2 as the distance to the target surface increases 10 mm, T[sub e] (in the range 0.7-0.8 eV) only decreases 10% between 2 and 4 mm from the target to remain nearly constant for longer distances. While T[sub e] is almost constant in time at the studied distances, N[sub e] presents a maximum at a time delay that increases when increasing the distance to the target surface. The space-time constancy of T[sub e] is related to a collisional decoupling of the heavy species in the plasma for distances longer than 2-4 mm. © 2001 American Institute of Physics.


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