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We show a phase-locked array of three quantum cascade lasers with anintegrated Talbot cavity at one side of the laser array. The coupling scheme iscalled diffraction coupling. By controlling the length of Talbot to be aquarter of Talbot distance (Zt/4), in-phase mode operation can be selected. Thein-phase operation shows great modal stability under different injectioncurrents, from the threshold current to the full power current. The far-fieldradiation pattern of the in-phase operation contains three lobes, one centralmaximum lobe and two side lobes. The interval between adjacent lobes is about10.5{\deg}. The output power is about 1.5 times that of a single-ridge laser.Further studies should be taken to achieve better beam performance and reduceoptical losses brought by the integrated Talbot cavity.

Phase-locked array of quantum cascade lasers with an integrated Talbot cavity