Abstract
Stimulated cross-cavity photon emission and carrier depletion in closely packed microlaser arrays supports the propagation of long-range intercavity oscillations in the coupled populations of coherent photons and carriers. The related periodic variations in the cavity radiation envelopes propagate as slow optical waves over the array at sonic group velocity. Externally driven excitation of such waves is investigated by numerical simulations and compared with theoretically obtained dispersion relation. While the theoretical minimum group velocity tends to zero at the lattice dispersion band edges, the requirement that the spatial decay constant be much smaller than the inverse lattice period limits the useful parameter regime. The lowest observed propagation velocities are of the order of the sound speed (km/s), a five order of magnitude reduction.
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