Tunable-diode-laser spectroscopy of C_2H_2 using a 303 μm GaInAsSb/AlGaInAsSb distributed-feedback laser

Abstract

The mid-IR region beyond 3 microm is very attractive for gas sensing, since the fundamental absorption bands of several hydrocarbons are located in this range. We demonstrated, for the first time to our knowledge, the use of a novel GaInAsSb/AlGaInAsSb distributed-feedback laser emitting around 3.03 microm in a tunable-diode laser-spectroscopy application. The laser operates in continuous mode at room temperature with excellent single-mode and tuning properties. A comparison of the measurement results was made with the recently updated data on C212H(2) found in the HITRAN 2008 compilation. A good agreement was found between the measurements and the database. Wavelength modulation spectroscopy of acetylene at ambient conditions was made, and a sensitivity of 18 ppb (parts per billion) per meter at an integration time of 3 s corresponding to a relative absorption of 5 x 10(-6) was obtained. The optimum detection limit of the acetylene measurement in this wavelength modulation spectroscopy setup was better than 1.5 ppb m at an integration time of 600 seconds.

Effect of Annealing-Induced Interdiffusion on the Electronic Structure of Mid Infrared Emitting GaInAsSb/AlGaInAsSb Quantum Wells

“…One of the promising candidates for the detection and analysis of environmentally relevant gases is the material system of GaInAsSb/AlGaInAsSb. [1][2][3] Lasers made basing on this system with an emission wavelength beyond 3 m have recently been developed by several groups. 5,6) The quinary material used as a barrier has previously been shown to improve the long-wavelength laser operation by enhancing the hole confinement and allowing a more homogeneous electron injection into the quantum well (QW).…”

High-resolution methane spectroscopy using InGaAsSb/AlInGaAsSb laterally-coupled index-grating distributed feedback laser diode at 3.23 µm

“…Instead, DFB lasers have previously been produced using lateral complex coupling based on deposited Cr gratings [1,5,6] which eliminates the need for grating overgrowth.…”

CW DFB RT diode laser based sensor for trace-gas detection of ethane using novel compact multipass gas absorption cell

“…Monitoring elevated levels of ethane in exhaled human breath can be used as a non-invasive method to identify and monitor different diseases such as asthma, schizophrenia, and lung cancer [3]. A TDLAS trace-gas sensor based on a 3.36 µm continuous wave (CW) thermoelectrically cooled (TEC), distributed feedback (DFB) laser diode from nanoplus GmbH was developed [4][5][6]. An optimum interference free C 2 H 6 absorption line located at 2976.8 cm -1 was selected as the optimum target wavelength.…”