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This paper presents infrared photonic multiplexers integrated on silicon designed to be assembled with QCL or ICL arrays in order to realize different possible broadband powerful tunable sources in the mid-infrared for multi-gas sensing.
Compared to the visible or near-infrared (NIR) spectral regions, there is a lack of very high sensitivity detectors in the mid-infrared (MIR) that operate near room temperature. Upconversion of the MIR light to NIR light that is imaged using affordable, fast, and sensitive NIR detectors or cameras represents an attractive possibility and the technique has been successfully demonstrated using a broad-spectrum...
Semiconductor disk lasers (SDLs) are capable of several Watts of continuous-wave (CW) output power in a single transverse mode, with emission demonstrated from the visible to the mid-infrared. Moreover, their highfinesse extended cavities allow the incorporation of intracavity nonlinear crystals to convert to wavelengths where direct emission of SDLs is non-trivial. SDLs based on InGaAs QWs exhibit...
The next-generation of fast, broadly tunable quantum cascade lasers (QCLs) is enabling the clinical translation of mid-infrared spectral imaging in high-throughput, high-confidence cancer screening. This new class of QCL source offers substantially faster tuning while also achieving superior wavelength scan-to-scan repeatability and reliability over extended operational periods. When integrated into...
Mid-infrared fiber lasers operating around 3.5 μm find applications in various fields such as remote sensing, polymer processing and spectroscopy. Recent demonstrations based on the 4F9/2 → 4I9/2 transition in Er3+:ZrF4 fibers have shown effective laser emission up to 1.52 W [1] by relying on a dual-wavelength pumping (DWP) scheme. This novel approach mitigates the low Stokes efficiency associated...
Isotopie measurements of methane are very important for environment. The level of gas in the atmosphere has significant impact on its radiative forcing, increase is estimated to 0.48 W/m2 since pre-industrial times [1]. Isotopic ratio of carbon in CH4 provides information about the origin of the gas. The recent development of compact interband cascade lasers (ICLs) permits the targeting of strong...
We present a first demonstration of photo-thermal detection of NO gas particles in a configuration using a 5.2 μm QCL as an excitation source and a simple fiber interferometer for probing the induced refractive index changes. The photo-thermal approach to laser gas spectroscopy is to a certain degree similar to the photo-acoustic technique [2]. Photo-thermal effect can be observed after exciting gas...
Cavity Resonator Grating Filters are a novel generation of reflective filters [1], They exhibit tailorable and narrow spectral bandwdidth [2], high reflectivity and large angular acceptance [3]. Their properties make them particularly interesting as output couplers for compact, robust, simplified cat's eye external cavity laser diodes. Indeed, laser diode stabilisation with such filters at 850 nm...
There is significant interest in high power laser sources that can work outside the Yb emission band, for example, near 1.5um wavelength, for many applications like eye safe material processing, free space light transmission, pump sources for other lasers and LIDAR. Raman fiber lasers offer an excellent method to achieve high powers in a variety of wavelength regions [1]. In its conventional implementation,...
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...
There is an increasing demand for tunable laser sources in the 8–12 μm spectral range for stand-off detection of chemical traces. In addition to high peak power, fast and wide spectral tunability are required. Among direct sources, external-cavity quantum cascade lasers (EC-QCL) have demonstrated a broad tunability with narrow linewidths and excellent beam quality [1] but their limited peak power...
MIR range Quantum Cascade Lasers (QCLs) find various sensing applications in security, health, gas sensing and spectral gas analysis. After some additional design and fabrication efforts, single mode or narrow band QCLs (DFB or grating-stabilized on external cavity) provide a direct access to spectral measurements of molecular fingerprints (ro-vibrational bands). However the simplest Fabry-Perot (FP)...
High-brightness continuous-wave (cw) beams at various wavelengths in the near and mid-infrared, visible, and ultraviolet are in demand for numerous applications spanning defence, astronomy, space-science, medicine and remote-sensing. While fiber lasers are an attractive solid-state technology for high-brightness cw beams, their output wavelengths are restricted to 1–1.1 μm (for ytterbium), 2 μm (thulium)...
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