Abstract
Phase-locked arrays of diode lasers have been studied as early as 1978.1 Initially, due to ease in fabrication, gain-guided arrays were studied. However, gain-guided arrays, just as individual gain-guided devices, proved inherently unstable due to optical-mode dependence on the injected-carrier profile and thermally induced gradients. Positive-index-guided devices were next tackled.2 It was quickly found that, due to gain-loss considerations, such devices prefer to operate in the out-of-phase condition.
© 1992 Optical Society of America
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