SPECTROSCOPE

摘要

A spectroscope comprising a plurality of interference filters (31, 32, ...) having different transmission wavelength bands arranged sequentially such that a light reflected off a specified interference filter (31) enters a next-stage interference filter (32), and photodetector elements (41, 42, ...) disposed at the impinging positions of lights passed through respective interference filters, wherein a thin silver film (31a) having a thickness of 20-200 nm is provided on the light incident face side of the first-stage interference filter.