| 摘要 |
PROBLEM TO BE SOLVED: To obtain a spectrometer in which wavelength resolution is enhanced while reducing the size by diffracting incident light on a diffraction grating, reflecting it again on the diffraction grating and detecting the converged rediffracted light. SOLUTION: Incident light 100 impinges on a diffraction grating 1a and diffracted light 103 impinges on a plane mirror 4. Reflected light 104 from the plane mirror 4 impinges again on the diffraction grating 1a. Rediffracted light 105 from the diffraction grating 1a is directed toward a concave mirror 2 and condensed to produce converged light 106 impinging on a detector 3. The converged light 106 is detected by each light receiving element constituting the photodetector 3 and the wavelength characteristic of the incident light 100 is determined based on the detection output from each light receiving element. Wavelength resolution is enhanced while reducing the size by providing a reflecting means, i.e., the plane mirror 4, for reflecting the diffracted light 103 toward the diffraction grating 1a thereby redifrracting the diffracted light 103.
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