Optical module which permits stable laser output
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United States of America Patent
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Jun 28, 2005
Grant Date -
Apr 24, 2003
app pub date -
Jul 31, 2001
filing date -
Feb 1, 2001
priority date (Note) -
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Abstract
An optical module for use in detecting a plurality of different wavelengths by making use of the multiple wavelength selectivity of an etalon. The optical module includes a semiconductor laser, a lens for converting a beam emitted from the semiconductor laser into a substantially parallel beam, a beam splitter for splitting the converted beam into a reflected beam and a transmitted beam, and a light-receiving element disposed such that one of the split beams is incident thereupon through an etalon, wherein a center of the reflected beam from the etalon occurring as the beam is incident upon the etalon is arranged to return to a region other than a beam-emitting portion of the semiconductor laser.
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