We report the sub-parts-per-billion-level detection of NO2 using tunable laser-based photoacoustic spectroscopy where the laser radiation is obtained from a room-temperature continuous-wave high-power quantum cascade laser operating in an external grating cavity configuration. The continuously tunable external grating cavity quantum cascade laser produces maximum single-frequency output of appr...

We demonstrate an efficient intracavity nonlinear interaction of laser modes in a specially adapted quantum cascade laser. A two-wavelength quantum cascade laser structure emitting at wavelengths of 7.1 and 9.5 micrometer included cascaded resonant optical intersubband transitions in an intracavity configuration leading to resonantly enhanced sum-frequency and second-harmonic generation at wave...

The quantum-cascade laser can be used as an infrared source for a small portable photoacoustic trace gas detector. The device that we describe uses a quantum-cascade laser without collimating optics mounted inside an acoustic resonator. The laser is positioned in the center of a longitudinal resonator at a pressure antinode and emits radiation along the length of the resonator exciting an axial...

Related Articles Enhancement of vertical emission in photonic crystal nanolasers Appl. Phys. Lett. 100, 121117 (2012) Tailoring chirp in spin-lasers Appl. Phys. Lett. 100, 121111 (2012) Blue monolithic II-VI-based vertical-cavity surface-emitting laser Appl. Phys. Lett. 100, 121102 (2012) High-performance uncooled distributed-feedback quantum cascade laser without lateral regrowth Appl. Phys. L...

Related Articles Rate equation analysis of injection-locked quantum cascade lasers J. Appl. Phys. 113, 063104 (2013) A quantum cascade laser absorption spectrometer devoted to the in situ measurement of atmospheric N2O and CH4 emission fluxes Rev. Sci. Instrum. 84, 023103 (2013) High beta lasing in micropillar cavities with adiabatic layer design Appl. Phys. Lett. 102, 052114 (2013) Portable op...