This report summarizes various features of a code (originally brought to the Los Alamos Scientific Laboratory (LASL) by F. Tappert of the Courant Institute in New York) designed to solve the three-dimensional parabolic wave equation with an added nonlinear (self-focusing) term. Some exact conservation laws of the full nonlinear equation are considered. The precise numerical method used to solve the equation is explicitly displayed. Comparisons of numerically computed results with exact results for a sample pure diffraction problem are made. A discussion of various input data for the code, which now exists in two different versions, is given.
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