Coherent Coupling Of Independent Grating-Surface-Emitting Diode-Laser Arrays Using An External Prism

Pairs of grating surface‐emitting arrays, on a single wafer but free‐running, were externally coupled with a prism. The prism acted as an optical coupler between one distributed Bragg reflector in each array. Injection locking was demonstrated by observing a dramatic increase in the lateral coherence of the far field of the prism‐coupled arrays.