A compact quantum-cascade laser based spectrometer for monitoring the concentrations of methane and nitrous oxide in the troposphere

In-flight measurements of ambient methane, nitrous oxide and water have been made using frequency down-chirped radiation from a compact, pulsed, quantum-cascade laser spectrometer. In three flights from Oxford airport in October 2006 the variations…

A tunable quantum-cascade (QC) laser has been flown on NASA's ER-2 high-altitude aircraft to produce the first atmospheric gas measurements with this newly invented device, an important milestone in the QC laser's future planetary, industrial, and…

A continuous wave quantum cascade laser (QCL), operating near 8.1 μm, was used for wavelength modulation spectroscopy of methane (CH 4 and nitrous oxide (N 2 O) stable isotopes. Several rotational transitions of 14 N 2 16 O, 15 N 14 N 16 O, 14 N 2…

We report the development of a field-deployable, pulsed quantum cascade laser spectrometer. The instrument is designed to measure the C-13/C-12 isotopic ratio in the CO2 released from volcanic vents. Specific (CO2)-C-12 and (CO2)-C-13 absorption…

Simultaneous concentration measurements of the three main stable carbon dioxide isotopologueS ((OCO)-O-16-C-12-O-16, (OCO)-O-16-C-13-O-16 and (OCO)-O-18-C-12-O-16) in ambient air are demonstrated. The instrument employs a quasi-room temperature,…

We have recently developed a spectrometer that is based on a pulsed distributed feedback quantum cascade laser and a non-resonant multi-pass White cell. We will report on the use of our spectrometer for the trace level detection of a range of key…

We have developed a compact sensor system for environmental CO2 studies based on quantum cascade laser. The sensor targets the strongest fundamental CO2 ro-vibrational band at 4.24&x03BC;m and requires only 8mm optical path to provide sensitivity of…

A compact quantum cascade laser module is presented. That is based on conductive as well as convective cooling for efficient heat dissipation. Quantum cascade lasers with selectively doped active regions achieve better thermal behavior.

Laser spectroscopy is an emerging technique to analyze the stable isotopic composition of soil-respired CO2 (delta C-13(resp) delta O-18(resp)) in situ and at high temporal resolution Here we present the first application of a quantum cascade…

The fluxes of the greenhouse gases methane (CH4) and nitrous oxide (N2O) were measured in mangrove wetlands in Queensland, Australia, using the closed chamber technique. Large differences in the fluxes of both gases from different study sites were…