| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-cost small-sized wavelength monitoring system. SOLUTION: An apparatus for monitoring the radiation wavelength of a laser (10) comprises a semiconductor slice or slab (14), having first and second opposed surfaces (141, 142). A part of the slice (14) is exposed to radiation at an angle so as to be incident on the first surface (141) at an angle in the vicinity of the Brewster angle to the first surface (141). Accordingly, the radiation is refracted into the slice (14), and propagated toward the second surface (142) of the slice (14). The apparatus further comprises a wavelength selection filter (15), disposed on the second surface (142) having an associated photodetector (11), which generates a signal (110) indicative of the wavelength of the radiation.
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