Modal Interferometer Simulation Tool (MIST) is a MATLAB toolbox that can simulate arbitrary resonant optical systems in the paraxial beam approximation. It allows the user to define any optical setup (composed typically of laser sources, mirrors, lenses, electro-optical modulators and detectors) and to compute the static laser field at any point. It uses a Hermite-Gauss modal decomposition to simulate diffraction limited optics.
This tool is being developed mainly for simulation of large scale interferometers with resonant cavities used for the detection of gravitational waves.
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If you use MIST in your own simulation work, please cite is as
G. Vajente, "Fast modal simulation of paraxial optical systems: the MIST open source toolbox"
Classical and Quantum Gravity 30, 075014 (2013)
Optics-mist works excellent.