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A design method for freeform optical systems containing diffraction gratings is developed based on Fermat's principle and Ludwig's grating ray-tracing equation. The proposed method can calculate fine starting-points for diffraction-grating-based… Click to show full abstract
A design method for freeform optical systems containing diffraction gratings is developed based on Fermat's principle and Ludwig's grating ray-tracing equation. The proposed method can calculate fine starting-points for diffraction-grating-based imaging spectrometers with high performance and novel geometries. It can also be extended to design optical systems that contain other dispersive elements, such as prisms and diffractive optics. Two freeform imaging spectrometers are designed by this method to meet the diffraction-limited specifications.
Journal Title: Optics express
Year Published: 2018
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