Spectral resolution enhancement device

A spectral resolution enhancement device, comprising:

• a preliminary dispersion unit, a two-grating angular dispersion amplification unit, and a detection unit, wherein
• the preliminary dispersion unit is configured to receive collimated incident light and emits light of different wavelengths in the incident light at different angles,
• the two-grating angular dispersion amplification unit is configured to diffract the light of different wavelengths emitted from the preliminary dispersion unit at least three times, such that angular dispersions of the light of different wavelengths is enhanced, and emergent angle deviations of the light of different wavelengths are increased,
• the detection unit is configured to detect the light of different wavelengths emitted from the two-grating angular dispersion amplification unit, and since the emergent angle deviations of the light of different wavelengths are increased, resolution of the detection unit for the light of different wavelengths is increased,
• the two-grating angular dispersion amplification unit comprises a first blazed grating and a second blazed grating,
• the first blazed grating receives the light emitted from the preliminary dispersion unit with different wavelengths and diffracts the light with different wavelengths to the second blazed grating,
• the second blazed grating receives the light diffracted from the first blazed grating with different wavelengths and diffracts the light with different wavelengths to the first blazed grating, and the foregoing is repeated,
• finally, diffracted light with different wavelengths is emitted to the detection unit after being diffracted by the first blazed grating or the second blazed grating,
• when the diffracted light with different wavelengths is emitted to the detection unit after being diffracted by the first blazed grating, an incident angle of the light is changed from being greater than a Littrow angle to being less than the Littrow angle when the light is diffracted multiple times between the first blazed grating and the second blazed grating through arrangement of positions of the first blazed grating and the second blazed grating,
• the detection unit includes:
• a beam splitter, an imaging lens, and a detector,
• the imaging lens is configured to focus the emitted light with different wavelengths on the detector,
• the detector is configured to detect the light with different wavelengths and emitted from the two-grating angular dispersion amplification unit.