Tunable diode laser absorption spectroscopy of carbon monoxide around 235 μm

Abstract

Novel GaInSbAs/GaSb multiple-quantum-well lasers operating near room temperature have been successfully used for tunable diode laser absorption spectroscopy in the vicinity of 2.35 mum. Continuous current tuning over a more than 150-GHz frequency range has been realized. Direct absorption measurements have been carried out on the R, R, R, and R lines of carbon monoxide. Traces of carbon monoxide at the level of 0.3 part in 10(6) in volume at 100 Torr could be detected by the low-frequency wavelength-modulation technique and an astigmatic multipass cell. These results show a potential use of these diode lasers in portable low-cost trace-pollutant sensors.

Carrier dynamics and photoluminescence quenching mechanism of strained InGaSb/AlGaSb quantum wells

“…Near-infrared emitters can be used for a wide range of applications such as gas sensing, 1 monitoring of environmental pollution such as carbon monoxide and phosphine, [2][3][4] military scene projection, thermo-photovoltaic (TPV) devices, 5,6 and low-loss fibre optical communication. 7 Especially, vertical cavity surface emitting lasers (VCSELs) or vertical external cavity surface emitting lasers (VECSELs) have wide range of applications.…”

Design and characteristics of quantum cascade laser-based CO detection system

“…From comparison of these data the laser linewidth was found to be less than 100 MHz. The possible reasons of errors are the poor fineness of the germanium etalon and minor nonlinearities in frequency versus current, which affect the frequency calibration of experimental spectra [29]. The corresponding absorption cross-sections of 1% CO in air were calculated on the basis of a molecular spectroscopic database from HITRAN 2003.…”

Simultaneous in situ measurement of CO, H _ 2 O, and gas temperatures in a full-sized coal-fired power plant by near-infrared diode lasers

“…But NIR TDL applications suffer to a certain extent from the low absorption coefficients that are provided by most overtone and combination bands. This is especially true for the second overtone of CO near 1.5 m. 9,10 But, despite recent progress in the development of RT InSb TDLs for the first vibrational overtone band at 2.3 m, [11][12][13] and even of near-RT quantum cascade lasers that are suitable for the fundamental vibrational transition at 4.6 m, 14,15 NIR TDLs still seem to be a good compromise for applications that offer long absorption paths and require only moderate sensitivity. This is particularly true as long as InSb lasers are not commercially available and the quantum cascade lasers suffer from unpredictable long-term reliability, lack of RT detectors, and the need for special pulsing electronics.…”