System and method for laser temperature compensation
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United States of America Patent
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Oct 28, 2008
Grant Date -
Jun 5, 2008
app pub date -
Apr 20, 2007
filing date -
Dec 4, 2006
priority date (Note) -
Expired
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Abstract
A method for compensating for changes in output power or wavelength of an optical source with temperature. Many optical sources have power and/or wavelength variations with temperature which can be compensated by open-or closed-loop methods if a method of accurately measuring the optical source temperature is available. The voltage across a semiconductor junction varies with temperature. Measuring the optical source power or wavelength variation with temperature and tracking the voltage across the semiconductor junction provides a means for compensating an instrument for temperature induced optical output power or wavelength variations. An important field of application is optical density or turbidity measurements in cellular media.
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