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Quantum Cascade Lasers (QCLs) have become one of the most used light sources in the Mid-IR. It has been demonstrated that QCLs can operate as frequency combs (FCs) [1] and that the performance of QCL FCs can be significantly improved by compensating for their waveguide dispersion using dielectric coating based Gires-Tournois interferometers [2]. However, the latter are incompatible with high optical...
Flicker noise was studied in a set of 20 QCLs at 7–8 µm, showing significant differences among the devices and the probable existence of various noise sources. Ridgewaveguide lasers showed lower noise than buried-heterostructures.
Quantum Cascade Lasers (QCLs) are considered as one of the most versatile sources of light in the mid-IR spectral range. The need for mid-IR lasers not only emitting at precisely selected wavelengths but showing also a high spectral purity is now growing, driven by numerous possible applications such as high-resolution spectroscopy in the molecular fingerprint region, e.g. in combination with optical...
Frequency noise and linewidth properties of different mid-infrared DFB-QCLs using buried-heterostructures and ridge waveguides are compared. The physical origin of frequency noise and the impact of the different lasers parameters are discussed.
Continuous-wave operating singlemode quantum-cascade lasers with a threshold current of 75 mA and total power consumption of less than 2 W are presented. The lasers are grown by metal-organic vapour- phase epitaxy; they function up to temperatures higher than 50degC and the emission wavelength is 5.25 mum.
We report power, line width and mode purity for a cw 5.5 mum quantum cascade laser at -26 C. We detect atmospheric NO with high sensitivity (0.5 ppb Hz-1/2) using rapid sweep, direct absorption spectroscopy.
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