  We introduce the concept of supersymmetric laser arrays that consists of a
main optical lattice and its superpartner structure, and we investigate the
onset of their lasing oscillations. Due to the coupling of the two constituent
lattices, their degenerate optical modes form doublets, while the extra mode
associated with unbroken supersymmetry forms a singlet state. Singlet lasing
can be achieved for a wide range of design parameters either by introducing
stronger loss in the partner lattice or by pumping only the main array. Our
findings suggest the possibility of building single-mode, high-power laser
arrays and are also important for understanding light transport dynamics in
multimode Parity-Time symmetric photonic structures.
