Resolving Sodium Doublet by Using a Czerny-Turner Setup

Czerny-Turner setup 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. In this example, a Czerny-Turner setup, consisting of reflective mirrors and diffractive gratings, for examining the Sodium doublet is presented. Particularly, the diffraction efficiency of the grating calculated with Fourier modal method (FMM).