Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

140 W peak power laser system tunable in the LWIR

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

Volltext (PDF; )

Optics Express 25 (2017), Nr.16, S.18897-18906
ISSN: 1094-4087
European Commission EC
FP7-ICT project; 317884; MIRIFISENS
Mid InfraRed Innovative lasers For Improved SENSor of hazardous sunstances
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IAF ()

We present a high peak power rapidly tunable laser system in the long-wave infrared comprising an external-cavity quantum cascade laser (EC-QCL) broadly tunable from 8 to 10 µm and an optical parametric amplifier (OPA) based on quasi phase-matching in orientation-patterned gallium arsenide (OP-GaAs) of fixed grating period. The nonlinear crystal is pumped by a pulsed fiber laser system to achieve efficient amplification in the OPA. Quasi phase-matching remains satisfied when the EC-QCL wavelength is swept from 8 to 10 µm with a crystal of fixed grating period through tuning the pump laser source around 2 µm. The OPA demonstrates parametric amplification from 8 µm to 10 µm and achieves output peak powers up to 140 W with spectral linewidths below 3.5 cm−1. The beam profile quality (M2) remains below 3.4 in both horizontal and vertical directions. Compared to the EC-QCL, the linewidth broadening is attributed to a coupling with the OPA.