Abstract

We have observed some of the absorption lines from the molecules 12CO2 and 13CO2 in the 1.6-μm spectral region with the use of specially fabricated single-mode InGaAsP distributed-feedback semiconductor diode lasers. Using a 23.6-m-long multipass absorption cell in combination with radio-frequency modulation and detection techniques, we measured the 12CO2:13CO2 isotopic ratio of two specific lines at 6253.73 and 6253.90 cm−1 with sufficient precision for diagnostic medical tests that analyze CO2 on human breath.

© 1993 Optical Society of America

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