Martín Mateos, PedroGenner, AndreasMoser, HaraldLendl, Bernhard2023-01-302023-01-302019-05-27Martín-Mateos, P., Genner, A., Moser, H. & Lendl, B. (2019). Implementation and characterization of a thermal infrared laser heterodyne radiometer based on a wavelength modulated local oscillator laser. Optics Express, 27(11), 15575.1094-4087https://hdl.handle.net/10016/36410This article presents the first implementation and the experimental characterization of a thermal infrared wavelength modulation laser heterodyne radiometer (WM-LHR) based on an external cavity quantum cascade laser. This novel WM-LHR system has demonstrated calibration-free operation, a superior signal to noise ratio and, more importantly, has opened the door for cost-efficient wide spectral range laser heterodyne radiometry in the near future.10eng© 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.Infrared lasersLaser beamsLaser sourcesQuantum cascade semiconductor lasersSpectroscopyTunable lasersresearch articleElectrónicahttps://doi.org/10.1364/OE.27.015575open access155751115584Optics Express27AR/0000023827