An instrument was developed based on infrared backscattering spectroscopy. We realized a pulsed laser system with a fast tunability from 8 to 10 μm using an external-cavity quantum cascade laser (EC-QCL) and optical parametric amplification (OPA). The EC-QCL is tunable from 8 to 10 μm and delivers output peak powers up to 500 mW. The peak power is amplified with high gain in an orientation-patterned gallium arsenide (OP-GaAs) nonlinear crystal. We developed a pulsed fiber laser acousto-optically tunable from 1880 to 1980 nm with output peak powers up to 7 kW as pump source to realize an efficient quasi-phase matched OPA without any mechanical or thermal action onto the nonlinear crystal. Mixing the EC-QCL and the pump beams within the OP-GaAs crystal and tuning the pump wavelength enables parametric amplification of the EC-QCL from 8 to 10 μm leading to up to 120 W peak power. The output is transmitted to a target at a distance of 10 – 20 m. A receiver based on a broadband infrared detector comprises a few detector elements. A 3D data cube is registered by wavelength tuning the laser emission while recording a synchronized signal received from the target. The presentation will describe the AMURFOCAL instrument, its functional units and its principles of operation.
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F. Gutty, A. Grisard, C. Larat, D. Papillon, M. Schwarz, E. Lallier, H. D. Tholl, F. Münzhuber, J. Kunz, M. Raab, M. Rattunde, Stefan Hugger, Mariusz Kastek, Tadeusz Piatkowski, François Brygo, Cédric Awanzino, Frank Wilsenack, "100 W-level peak power laser system tunable in the LWIR applied to detection of persistent chemical agents," Proc. SPIE 10639, Micro- and Nanotechnology Sensors, Systems, and Applications X, 106392E (14 May 2018);