INJECTION LOCKING OF ANTIGUIDED RESONANT OPTICAL WAVE-GUIDE ARRAYS

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 X I(th)) 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 greater-than-or-equal-to 30 angstrom spectral range for emission in the 8500 angstrom region, while the beam pattern remains spatially stable and diffraction limited. For devices operating nearly resonant (i.e., beam width 2 to 3 X the diffraction limit) injection locking accomplishes both single-frequency as well as diffraction-limited-beam operation.