| 摘要 |
An optical band-pass filter adapted for enabling mutually independent fine adjustments of two pass bands. The optical band-pass filter comprises a first filter having a first pass band, first and second reflective films for respectively reflecting the transmitted light and the reflected light obtained from the first filter film, and a second filter film having a second pass band different from the first pass band and serving to combine the light out of the first and second reflective films with each other.
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