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High peak-power laser system tuneable from 8 to 10 μm

: Gutty, F.; Grisard, A.; Larat, C.; Papillon, D.; Schwarz, M.; Gérard, B.; Ostendorf, R.; Wagner, J.; Lallier, E.


Advanced Optical Technologies 6 (2017), Nr.2, S.95-101
ISSN: 2192-8584
ISSN: 2192-8576
Fraunhofer IAF ()
fiber optics amplifiers and oscillators; laser; parametric oscillators and amplifiers; parametric processes in nonlinear optics; quantum cascade lasers; tuneable lasers

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