Near-IR and visible room-temperature diode lasers in broadly tunable external-cavity configurations are becoming commercially available for gas-sensing applications. Near 1.57 μm, a coincidence of overtone and combination-band transitions from CO, CO<sub>2</sub>, OH, and H<sub>2</sub>O is particularly interesting for combustion and combustor emissions monitoring. We report initial observations of the room-temperature absorption of CO and CO<sub>2</sub> made with a commercial external-cavity diode laser.
© 1997 Optical Society of America
David M. Sonnenfroh and Mark G. Allen, "Observation of CO and CO2 absorption near 1.57 µm with an external-cavity diode laser," Appl. Opt. 36, 3298-3300 (1997)