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100 W-level peak-power laser system tunable from 8 to 10 μm

: Gutty, Francois; Grisard, Arnaud; Larat, Christian; Papillon, Dominique; Schwarz, Muriel; Gerard, Bruno; Ostendorf, Ralf; Rattunde, Marcel; Wagner, Joachim; Lallier, Eric


Institute of Electrical and Electronics Engineers -IEEE-:
Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference, CLEO/Europe-EQEC 2017 : 25-29 June 2017, Munich, Germany
Piscataway, NJ: IEEE, 2017
ISBN: 978-1-5090-6736-7
ISBN: 978-1-5090-6737-4
Conference on Lasers and Electro-Optics Europe (CLEO) <2017, Munich>
European Quantum Electronics Conference (EQEC) <2017, Munich>
Fraunhofer IAF ()

Summary form only given. 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 restricts the stand-off detection range to a few meters. Orientation patterned GaAs (OP-GaAs) is an excellent nonlinear crystal candidate to reach this wavelength range through a three waves mixing process. A widely tunable pulsed optical parametric oscillator (OPO) was demonstrated [2] at the expense of a complex pump at 3 μm. A narrow linewidth OPO was reported in [3] but the crystal temperature tuning range remains limited and slowly addressed. Recently, we reported on a ~40 W laser system tunable from 7.5 to 9 μm using parametric amplification (OPA) of an EC-QCL and a fast tunable thulium-doped fiber pump [4]. We present here an improved laser system tunable from 8 to 10 μm and delivering up to 140 W peak power thanks to a more robust polarization maintaining pump laser.