Spectroscopic device, spectroscopic method, Raman scattering analysis device, luminescence spectroscopic analysis device, and harmonic observation device

A spectroscopic device comprising:

• a light source unit configured to output signal light generated from a sample;
• a Fourier spectroscopic unit configured to receive the signal light, generate a pair of light beams with any time delay, and output first output light obtained by causing the pair of light beams to interfere with each other;
• a wavelength dispersion spectroscopic circuitry configured to input the first output light that is output from the Fourier spectroscopic unit, and detect second output light obtained by dispersing the received first output light according to a wavelength;
• and
• a control device configured to extract a component of the signal light in the second output light based on a detection result of the second output light, wherein
• the control device comprises:
• a control unit configured to remove a stray light component and extract the component of the signal light in the second output light based on the detection result of the second output light,
• a display unit configured to display a display image in which the detection result is imaged and the component of the signal light is extracted based on image processing, and
• the control unit controls the Fourier spectroscopic unit, generates an interferogram corresponding to all wavelengths in the second output light based on a detection value of the second output light detected by adjusting the time delay, performs Fourier transform on the interferogram, calculates a Fourier spectrum corresponding to the all wavelengths in the second output light, generates a two-dimensional map based on image processing that plots the Fourier spectrum serving as a first axis and spectrum of the detection value of the second output light detected by the wavelength dispersion spectroscopic circuitry serving as a second axis, and extracts the component of the signal light from which the stray light component is removed based on a correlation between values along the first axis and the second axis in the two-dimensional map.