We present a novel design method of freeform imaging spectrometers. All the freeform surfaces including the grating surface are generated point-by-point. The rays coming from multiple wavelengths, multiple fields and different pupil coordinates are used, and the refractive/reflective as well as the diffraction of grating are considered simultaneously. To demonstrate the feasibility of the proposed method, we successfully designed a compact freeform reflective imaging spectrometer.

© 2018 Optical Society of Japan

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