Patent ID: 7538885
Filing Date: 2009-05-26
Classification: G01B,G01J,G01M,G01N,G02B,H04J

Abstract:
1. An optical characteristic measuring apparatus for measuring an optical characteristic of a measuring object, the optical characteristic measuring apparatus comprising; a light source section which sweeps wavelengths of a first input light and a second input light respectively, frequencies of the first input light and the second input light being different from each other and polarized states of the first input light and the second input light being perpendicular to each other, and outputs the first input light and the second input light; an interference section which branches each of the first input light and the second input light from the light source section, inputs one branched light to the measuring object, makes output light from the measuring object interfere with other branched light, and outputs a plurality of interference lights; a plurality of light receiving sections which are respectively provided for the interference lights outputted from the interference section, receives the interference lights respectively, and outputs signals in accordance with optical powers of the interference lights respectively; and a low-pass filter for filtering the signals outputted from the light receiving sections, wherein the plurality of interference lights includes: a first interference light in which the first input light interferes with an output light in a first polarized state of the output light from the measuring object; a second interference light in which the second input light interferes with the output light in the first polarized state of the output light from the measuring object; a third interference light in which the first input light interfere with an output light in a second polarized state of the output light from the measuring object: and a fourth interference light in which the second input light interferes with the output light in the second polarized state of the output light from the measuring object, and the first polarized state of the output light and the second polarized state of the output light are perpendicular to each other.