Abstract
In most focused laser irradiations of slabs there are several significant two- and three-dimensional effects in the resultant material motion. By using a “natural” coordinate system it is possible to account for the most significant features of these effects in a one-dimensional calculation. The essential requirement is to find a coordinate system wherein the contours of constant density, temperature, etc., coincide approximately with the coordinate lines. For one such coordinate system, an “ellipsoidal” coordinate system, we obtain the fluid equations and discuss the approximations that are necessary to obtain one-dimensional equations.
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