Laser control method and laser control circuit
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United States of America Patent
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Jan 10, 2012
Grant Date -
Jun 17, 2010
app pub date -
Nov 25, 2009
filing date -
Dec 16, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A laser control method includes the steps of: using a laser control circuit which includes a constant current circuit that maintains a constant current flowing through a semiconductor laser element, and which includes an adder and a multiplier connected to a stage preceding the constant current circuit, and using detection means for calibration for detecting an applied laser output; calculating, on the basis of a detection signal output from the detection means, a reference bias value and a reference gain value for obtaining a specified laser output with respect to a specified input to the multiplier; inputting the reference bias value and the reference gain value to the adder and the multiplier, respectively; and controlling the applied laser output from the semiconductor laser element by performing calibration.
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