Software for simulation and analysis of far-field diffraction patterns in transient grating spectroscopy

We present a software package for the simulation and analysis of far-field diffraction patterns in transient grating (TG) spectroscopy. The code is designed to assist both experimental planning and post-processing interpretation by modeling the optical response of TG configurations across a wide range of conditions. It supports input through structured MATLAB variables or Excel-based spreadsheets and provides automated consistency checks and visual output generation. The implementation includes integration over detector pixels, enabling realistic simulations that account for spatial averaging and resolution effects. We demonstrate the software’s capabilities through representative use cases, including the influence of the grating-to-sample distance, the pump-to-probe intensity ratio, and the selection of the division parameter governing pixel integration accuracy. The code is freely available and modular, facilitating its adaptation to different experimental geometries and beam conditions. While full validation is provided elsewhere, this work establishes the core methodology and illustrates the practical value of the tool for TG spectroscopy research.