In-Situ Monitoring of Gases and Pollutants
PI: D. Danetski
In-situ monitoring of gases, non-organic and organic pOllutants in atmosphere, combustion products, power plant exhaust can be performed by Infrared absorption spectroscopy with GaSbbased diode lasers operating in the 2 2.4 [lm atmospheric transparency window. In this wavelength range the noise from both scattered solar radiation and thermal radiation of Earth is minimal compared to others transparency windows. Operation at longer wavelengths
allows detecting smaller concentrations because of relatively stronger absorption. For example, CO-absorption in the 2.3-[lm overtone band is 170 times stronger than that in the currently used
1 .56- [lm overtone band.
Semiconductor diode lasers offer the potential of high-power light source with the advantages of superior conversion efficiency, simplicity of electrical modulation, compact hardware design and low cost. The laser design developed in SUNY demonstrates the lowest threshoid current and the world-record continuouswave output power. The semi-conductor GaSb-based lasers developed at Stony Brook University demonstrate the lowest threshold room-temperature operation with world-record output parameters. (Power Photonic Corp.)