Design and modeling of spectrographs with holographic gratings on freeform surfaces
Design and modeling of spectrographs with holographic gratings on freeform surfaces
We demonstrate the approach of using a holographic grating on a freeform surface for advanced spectrographs design. We discuss the surface and groove pattern description used for ray tracing. Moreover, we present a general procedure of diffraction efficiency calculation, which accounts for the change of hologram recording and operation conditions …