Abstract
We have demonstrated quantitative chemical vapor detection with a multimode quantum cascade (QC) laser. Experiments incorporated pseudorandom code (PRC) modulation of the laser intensity to permit sensitive absorption measurements of isopropanol vapor at . The demonstration shows the practicality of one technical approach for implementing low-peak-power QC lasers in the transmitter portion of a differential absorption lidar (DIAL) system. With a 31-chip, PRC sequence, the measured isopropanol detection limit was 12 parts in by volume times meters ( absorption) for a simple backscatter-absorption measurement configuration.
© 2000 Optical Society of America
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