| 摘要 |
A spectrum measuring device for measuring optical spectrum of input light includes first and second double-image elements which separate input light to be measured into two polarized wave components having respective planes of polarization perpendicularly intersecting each other and having different optical axes, a third double-image element which separates the two polarized wave components from the first and second double-image elements into four polarized wave components each two of which having respective planes of polarization perpendicularly intersecting each other and having different optical axes, a dispersing element which is irradiated by the four polarized wave components from the third double-image element in which the dispersing element separates optical components of each wavelength contained in the four polarized wave components at the same angle of separation, and a photodetector for measuring an overall intensity of the four polarized wave components of the same wavelength separated by the dispersing element.
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