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2017
Journal Article
Titel
High peak-power laser system tuneable from 8 to 10 mm
Abstract
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 mm 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 mm, 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 mm. The OPA demonstrates parametric amplification from 8 to 10 mm 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.
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