I am just starting to learn Zemax. Now I am trying to simulate my laser, which can generate Green light by external second harmonic generation. My simulation result for the fundemental beam is very close to the measurement data. To simulate the harmonic beam, I assume that a) harmonics beam and fundemetal beam have same M2 and divergence, b) harmonic beam waist location is at nonlinear crystal center. However the simulation result (beam size and divergence at far field) for harmonic beam does not match real harmonic beam (measured by laser beam profiler) at all. Can anyone help me? how can I model harmonic generation in Zemax
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