In the present work, we demonstrate the phase-stabilization of a MIR QCL source to a novel 9 µm frequency comb originating from a femtosecond mode-locked fiber laser. This MIR comb system has been commercially supplied by MenloSystems. By beating a DFB-QCL with one of the comb tooth on a fast QCD detector, we were able to phase-stabilize the resulting relative beat-note signal at the Hz level , and thus to copy the spectral performance of the MIR comb to the QCL. By measuring the beating of the comb teeth, we also demonstrated the electrical bandwidth optical characterisation of a quantum detectors .

In the future we are aiming to combine this stabilized QCL with a quantum detector to demonstrate the most sensitive heterodyne detection system that will endow applications such as high-resolution spectroscopy, coherent LIDAR measurements, test and design of systems for free-space coherent optical communications with GBits/s data transfer rate.