| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical fiber incidence type spectroscope which divides a signal light beam made incident through an optical fiber by a spectral element, without deteriorating sensitivity and reduces the complexity in correction in a spectral apparatus. SOLUTION: The fiber injection spectroscope comprises the optical fiber 218, a collimating optical system 231 which makes the signal light beam from the optical fiber 218 into a collimated light beam, the spectral element 236 which divides the signal light beam converted into the collimated light beam by the collimating optical system 231, a light-receiving element 237 in which a plurality of light-receiving elements 237a for receiving the signal light beam divided by the spectral element 236 are arranged, in at least a wavelength dispersion direction, and a condensing optical system 236, which allows the signal light beam from the spectral element 237 to be focused onto a light-receiving face of the light-receiving element 237. The condensing optical system 236 is configured so that the spot diameter of the signal light beam, focused onto the light-receiving face of the light-receiving element 237, is smaller than the arrangement pitch of the light-receiving element 237. The numerical aperture of the collimating optical system 231 is set to be larger than that of the optical fiber 218. COPYRIGHT: (C)2006,JPO&NCIPI
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