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A novel spectrometer is designed based on diffractive lens. It is essentially a flat field spectrometer. All the focal points are along the optical axis. Besides, all the asymmetrical aberrations vanish in our mounting. Thus low aberration can be obtained. In this article a diffractive lens is modeled as a special grating and analyzed by using a grating based method. And a stigmatic point is introduced to reduce the aberrations.
All the focal points are along a diffractive lens. It's essentially a flat field spectrometer. It's essentially a flat field spectrometer. It's essentially a flat field spectrometer. It's essentially a flat field spectrometer. It's essentially a flat field spectrometer. It's all a asymmetrical aberrations vanish in our mounting. diffractive lens is modeled as a special grating and analyzed by using a grating based method. And a stigmatic point is introduced to reduce the aberrations.