We present the direct observation of four-wave mixing over a detuning range of more than 3 THz in an InGaAs/AlInAs strain-compensated quantum cascade laser (QCL) amplifier emitting at 4.3 μm by simultaneous injection of a single mode QCL and a broadly tunable source. From its intensity, we determine a of 0.9 × 10−15 m2 V−2, in good agreement with transport model simulations based on the density matrix approach. This four-wave-mixing mechanism is an important driving factor in mode proliferation occurring in connection with the recent demonstration of comb generation in broadband QCLs.
Four-wave mixing in a quantum cascade laser amplifier
Peter Friedli, Hans Sigg, Borislav Hinkov, Andreas Hugi, Sabine Riedi, Mattias Beck, Jérôme Faist; Four-wave mixing in a quantum cascade laser amplifier. Appl. Phys. Lett. 3 June 2013; 102 (22): 222104. https://doi.org/10.1063/1.4807662
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