Fortran implementation solving coupled heat and SHG equations for pulsed Bessel-Gauss beams in type-II KTP crystals, tracking thermal effects and conversion efficiency evolution.

Open-source Fortran toolkit for simulating pulsed Gaussian second harmonic generation (SHG) in KTP crystal. Investigates efficiency changes with pulse energy, laser spot size, and cooling temperature using coupled field-phase-heat equations with thermal effects and phase mismatch analysis.