One kind Littrow-Offner type spectroscopic imaging system

The present invention relates to a Littrow-Offner spectroscopic imaging system for a spectrometer, especially for high-resolution, narrow operating band, the spectral width dimension of the spectrometer. The spectroscopic imaging system structure: in the light incident direction, the slits are sequentially arranged, a plane mirror, a meniscus lens, a concave mirror and a convex grating; meniscus lens, a concave mirror and a convex spherical type plane grating, which coaxial concentric, the ratio of the radius of the concave mirror and a convex grating is? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ; Image plane bent meniscus lens having a convex surface to the highest point of the convex vertex coincides with the grating surface. It has a relatively large aperture, high resolution, no spherical aberration, coma-free, simple and compact structure, good image quality and little distortion characteristics. The present invention employs a concentric structure, not only good image quality and processing and relatively easy assembly and adjustment; are spherical elements, help to reduce the material cost.