Spectroscopic polarimeter and device for automatically adjusting optical path difference

A spectropolarimetric apparatus comprising an integrated polarization interferometer that includes:

• a light source configured to emit light;
• a polarization interferometer configured to split the emitted light into a plurality of polarized light beams using a polarization beam splitter and irradiate at least some of the split polarized light beams to a reflective sample to output reflected light;
• and
• a spectrometer configured to measure physical properties of the reflective sample by analyzing the output light,
• wherein the spectropolarimetric apparatus further comprises an integration assembly configured to accommodate the light source and the spectrometer together,
• the polarization interferometer is accommodated in a housing,
• a light source terminal of the light source and a spectrometer terminal of the spectrometer are exposed on one side surface of the integration assembly, a light input terminal and a light output terminal are exposed on one side surface of the housing, and a connection is established between the light source terminal and the light input terminal and between the spectrometer terminal and the light output terminal when the integration assembly is coupled to the housing,
• a stepped portion is formed in an optical axis direction on the one side surface of the housing, on which the light input terminal and the light output terminal are exposed, so that the light input terminal is present at a position more protruding than that of the light output terminal, and
• a stepped portion is formed in the optical axis direction on the one side surface of the integration assembly, on which the light source terminal and the spectrometer terminal are exposed, so that the spectrometer terminal is present at a position more protruding than that of the light source terminal.