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  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1996),
  • paper CThK48

Dynamic modeling of laser-ablated plume expansion using time-resolved plasma temperatures

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Abstract

Previously attempted optical methods to study the expansion of a laser-ablated plume have relied on emission/absorption time-of-flight (TOP) profiles of atoms or ions.1,2 However, different transitions of the same atomic or ionic species can exhibit misleading differences in velocities and velocity distributions/ as shown in Fig. 1. Besides, the temperature obtained based on a shifted Maxwellian fit to such a TOP profile is artificially large due to the line-of-sight integration effect intrinsic to two-dimensional fluorescent imaging of a three-dimensional plume. The solution to these problems is a direct determination of plasma temperatures using the line intensity ratio method.

© 1996 Optical Society of America

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