Patent ID: 7864318

Claim:
A spectroscopic ellipsometer, comprising: a light source; a polarized light generating part for generating a multiple wavelength polarized light directed to an object by acquiring elliptically polarized lights from lights of a plurality of wavelengths, said lights being emitted from said light source, or by acquiring a circularly polarized light from a light of a specific wavelength included in said plurality of wavelengths and acquiring an elliptically polarized light from a light of another wavelength included in said plurality of wavelengths; a rotating analyzer where a reflected light of said multiple wavelength polarized light enters, said rotating analyzer rotating around a central axis parallel to an optical axis; a spectrometer for receiving a light directed from said rotating analyzer to acquire spectral intensity; and a polarization state acquiring part for acquiring a polarization state at each of said plurality of wavelengths of said reflected light on the basis of output of said spectrometer.