Low divergence laser diode
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United States of America Patent
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Sep 1, 1998
Grant Date -
N/A
app pub date -
Apr 4, 1997
filing date -
Apr 4, 1997
priority date (Note) -
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Abstract
The cavity of a laser diode is made longer than that which would be dictated by consideration of maximizing the efficiency of the diode. The lateral divergence of the emitted light beam is decreased as the cavity length increases. The lower lateral divergence enables the emitted light beam being focused to produce a greater depth of field for coupling into an optical fiber. In another case, when the fiber size is fixed, lower lateral divergence enables the emitted light beam to being fed into a lower numerical aperture fiber, or enables the beam divergence after fiber to be lower.
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