We report on the first demonstration of injection locking of strong index-guided large-aperture devices [20-element resonant-optical-waveguide (ROW) antiguided arrays] under pulsed operation. Full locking was achieved far above the threshold level (2.6×Ith) by injecting light from a master oscillator in a direction normal to the diode facet and only in one element of the 20-element ROW array. Single-frequency tuning is achieved over a ≥30 Å spectral range for emission in the 8500 Å region, while the beam pattern remains spatially stable and diffraction limited. For devices operating nearly resonant (i.e., beam width 2 to 3× the diffraction limit) injection locking accomplishes both single-frequency as well as diffraction-limited-beam operation.
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