A physical-optics-based simulation of Czerny–Turner monochromator, which consists of parabolic mirrors and blazed grating, is presented.
Czerny–Turner monochromator is widely used to analysis the spectral information of light sources. Typically, a parabolic mirror is used to collimated the source first, and then a diffraction grating will spatially separate the colors spatially. Only selected color is directed to the exit slit. A simulation of the complete monochromator, including real reflective mirrors and diffractive gratings is presented, especially with the grating modeled with Fourier modal method (FMM).