Semiconductor laser devices and methods
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United States of America Patent
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Oct 23, 2007
Grant Date -
Sep 27, 2007
app pub date -
Feb 28, 2005
filing date -
Aug 22, 2003
priority date (Note) -
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Abstract
A method for producing controllable light pulses includes the following steps: providing a heterojunction bipolar transistor structure including collector, base, and emitter regions of semiconductor materials; providing an optical resonant cavity enclosing at least a portion of the transistor structure; and coupling electrical signals with respect to the collector, base, and emitter regions, to switch back and forth between a stimulated emission mode that produces output laser pulses and a spontaneous emission mode. In a form of the method, the electrical signals include an AC excitation signal, and part of each excitation signal cycle is operative to produce stimulated emission, and another part of each excitation signal cycle is operative to produce spontaneous emission.
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