Injection locking of coupled-stripe diode laser arrays

Abstract

The control of the far-field beam pattern and the spectrum of 10-element laser diode array by injection locking to a single-mode master laser are described. With less than 3 mW of injected power an array output of 105 mW at a single frequency with a 0.5° wide far-field lobe is obtained. Similar results are observed when the entire array is illuminated by the master laser beam, or when only one of the stripes is illuminated. The narrow lobe contains 60–70% of the total power and is centered at an angle of about 4° relative to the normal of the array facet.