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Optical frequency combs (OFCs) generated by quantum cascade lasers (QCLs) have recently been proven in the mid infrared [1] and they have already been applied to spectroscopy in free-running operation [2]. It is clear however that for more demanding applications such as high-resolution and accuracy spectroscopy and metrology the performance obtained in free-running operation is not enough, since a...
Single mode THz QCLs have already shown their huge potential for metrological grade THz spectroscopy [1, 2] while, on the contrary, continuous-wave multimode broadband operation has only recently been demonstrated [3]. These sources show a comb emission regime with up to 600 GHz spectral coverage. This kind of sources are very promising for metrological-grade applications, such as high precision spectroscopy,...
Optical frequency combs generated by quantum cascade lasers have recently been proven in the mid infrared. The first attempt of frequency stabilizing a quantum cascade laser comb against a metrological mid-infrared frequency comb through a single phase-locking chain is presented.
A compact and simple laser spectroscopy apparatus at 4.5 μm, based on saturated-absorption cavity ring-down (SCAR), has approached the ultimate sensitivity of accelerator mass spectrometry, measuring radiocarbon dioxide concentration down to few parts per quadrillion.
Mid-infrared dual-comb spectroscopy by means of quantum cascade laser frequency combs is demonstrated. Broadband high resolution molecular spectroscopy is performed, showing the potential of quantum cascade laser combs as a compact, all solid-state, chemical sensor.
A room-temperature mid-infrared QCL is injection-locked by a narrow-linewidth comb-linked nonlinear source. The QCL reproduces the injected radiation within ∼94%, with a frequency noise reduction of 3–4 orders of magnitude.
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