| 摘要 |
There is provided a spectrometric optical system, comprising a reflection member having a concave surface formed along a first circle, a diffraction grating having an edge part and a convex surface formed along a second circle disposed concentrically with the first circle, on which the light reflected at the concave surface of the reflection member is incident, and an input element disposed at a predetermined position to the reflection member and the diffraction grating such that a diffracted light, emitted from the diffraction grating, having a wavelength region of not less than 600 nm to not more than 1100 nm, and reflected at the concave surface, passes between the input light input to the spectrometric optical system and the edge part of the diffraction grating. |
