Spectroscope

摘要

The present invention provides a small spectrocsope that has a short response time. A spectroscope according to one embodiment includes a beam deflector that includes an electro-optic crystal, having an electro-optic effect, and paired electrodes used to apply an electric field inside the electro-optic crystal; spectroscopic means for dispersing light output by the beam deflector; and wavelength selection means for selecting light having an arbitrary wavelength from the light dispersed and output by the spectroscopic means, wherein the spectroscopic means is a prism including a first prism and a second prism for which refractive index dispersion is greater than that of the first prism. The spectroscope further comprises dividing means for outputting, in two different directions, light that is input, wherein the light output in the two different directions enters the first prism and the second prism.