Patent ID: 8786854

Claim:
A spectroscopic detector comprising: a spectroscopic element which disperses light; a photodetector which detects the light dispersed by the spectroscopic element; and a condensing optical system which condenses the dispersed light to the photodetector, and which compensates for a deviation in a detected wavelength deriving from nonlinearity of an angle of emergence generated in the spectroscopic element through chromatic aberration of magnification; wherein assuming λ 1 is a minimum value of wavelengths captured by the photodetector, λ 2 is a maximum value of wavelengths captured by the photodetector, δ 1 is chromatic aberration of magnification at a maximum image height of the condensing optical system with respect to light of wavelength λ 1 , and δ 2 is chromatic aberration of magnification at a maximum image height of the condensing optical system with respect to light of wavelength λ 2 , the following conditional expression is satisfied: δ 1 >δ 2 .