Single-channel injection locking of a diode-laser array with a cw dye laser

Abstract
We report injection-locking studies on a gain-guided diode-laser array using a single-frequency cw tunable dye laser master oscillator. By injecting a single end element, both the spatial and spectral emission characteristics of the entire ten-element array could be controlled. The injection-locked array produced over 100 mW output in a single-lobed far-field beam (60 GHz wide. Furthermore, by varying the injection frequency, the far-field emission angle of the array could be continuously scanned over several degrees at a rate of 2.3×10−2 deg/GHz.