Laser module
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United States of America Patent
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Jan 19, 2010
Grant Date -
Jun 9, 2005
app pub date -
Nov 8, 2004
filing date -
May 8, 2002
priority date (Note) -
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Abstract
A laser module includes a semiconductor laser element and a feedback optical component forming an external cavity with the semiconductor laser element. Even if a ratio of a current threshold of the laser module changing according to a polarized state of returned light from the feedback optical component to a current threshold of the semiconductor laser element is in an arbitrary range within a predetermined range, a total value of a relative intensity noise occurring between a first frequency determined according to a cavity length of the external cavity and at least equal to or more than a frequency band of using a laser light and a second frequency calculated by multiplying the first frequency by a predetermined number is equal to or more than −40 dB.
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