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A simple external-cavity quantum cascade laser utilizing optical feedback from a partial reflector is reported. Using a ∼9.6µm QCL and off-the-shelf optics we demonstrate single-mode continuous tuning of 2.46cm−1 with ∼40mW power and ∼2.5MHz linewidth.

We demonstrate simultaneous detection of multiple airborne chemicals at low-ppb concentrations using a sensor based on a rapid tuning of an external cavity quantum cascade laser from 7.87-8.70 µm.

We report the fabrication of photonics components designed for mid-infrared quantum cascade lasers based on photodarkening of thin-film chalcogenide glasses. We measure propagation losses of 0.5 dB/cm for single-mode waveguides and demonstrate evanescent wave couplers.

Single-mode quantum cascade lasers (AlInAs/GaInAs heterostructures) are excellent candidates for mid-infrared chemical sensing applications. The development of an optical cavityenhanced trace gas detection apparatus (NICE-OHMS) will be discussed along with advanced electro-optical modulator design.

An optical cavity enhanced mid-infrared absorption apparatus has been developed that incorporates a continuous-wave, single-mode quantum cascade laser as its laser source. The highfinesse cavity acts to increase the effective pathlength sampled by the laser.