A Thermal Modeling Toolkit for Continuous-Wave Gaussian Second-Harmonic Generation in KTP Crystal

TL;DR

This paper introduces an open-source finite-difference toolkit for modeling temperature distributions in KTP crystals during continuous-wave second-harmonic generation, enabling detailed analysis of thermal effects in nonlinear optics.

Contribution

The authors present a comprehensive, validated, and reproducible software toolkit that consolidates previous models for thermal analysis in KTP under Gaussian CW pumping, with flexible scenario parameters.

Findings

Toolkit accurately reproduces published temperature distributions.

Supports a wide range of heat transfer scenarios and parameters.

Includes benchmark reporting and is openly available for research use.

Abstract

We release an open-source finite-difference toolkit for computing temperature fields in continuous-wave (CW) second-harmonic generation (SHG) using potassium titanyl phosphate (KTP) crystals under Gaussian end-pumping. The toolkit includes modules for geometry and material definitions, boundary and cooling models, and transient and steady-state finite-difference solvers. Users provide beam and crystal parameters along with cooling profiles, and the solver returns spatiotemporal temperature fields with radial and axial profiles as exportable datasets. This implementation consolidates previous work into a single versioned repository with reproducible pipelines and parameterized scenario sweeps covering temperature-dependent versus constant conductivity, convection with or without radiation, and heat-transfer coefficients from $6.5$ to $2.0 \times 10^{4}$~W~m$^{-2}$~K$^{-1}$. The compiled Fortran kernels include built-in benchmark reporting. Validation is performed by reproducing published temperature distributions and trends for KTP under Gaussian CW pumping. The code is available as an open-source GitHub repository and is released under the MIT license as version v1.0.0, with an archived release on Zenodo identified by DOI 10.5281/zenodo.17266421 for citation and long-term access.