Linearized Swept Laser Source for Optical Coherence Analysis System
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United States of America Patent
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Issued Date -
Mar 5, 2009
app pub date -
Feb 7, 2008
filing date -
Aug 27, 2007
priority date (Note) -
Abandoned
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Abstract
A frequency swept laser source that generates an optical signal that is tuned over a spectral scan band at single discrete wavelengths associated with longitudinal modes of the swept laser source. Laser hopping over discrete single cavity modes allows long laser coherence length even under dynamic very high speed tuning conditions. A ramp drive to the laser is used to linearize laser frequency tuning. A beam splitter is used to divide the optical signal between a reference arm leading to a reference reflector and a sample arm leading to a sample. A detector system detects the optical signal from the reference arm and the sample arm for generating depth profiles and images of the sample.
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