Laser diode module
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United States of America Patent
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Jan 3, 2006
Grant Date -
Nov 18, 2004
app pub date -
Jul 15, 2003
filing date -
Feb 26, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A laser diode module includes a laser diode device, a first photo detector part for receiving, first divided light that is a first portion of light when at least one of light emissions of the laser diode device is divided into two portions of light each traveling a different optical path, a second photo detector part for receiving second divided light that is a second portion of light thus divided via at least a wavelength selective member, and a controller which controls the lasing wavelength of the laser diode device on the basis of outputs of the first and second photo detector parts. A beam splitter provided between the laser diode and the wavelength selective member divides light emitted from the laser diode into the first and second divided light and a quarter-wave plate is provided in an optical path between the beam splitter and the wavelength selective member.
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