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A new twin-stripe leaky-mode (TLM) injection laser has been demonstrated. The structure consists of two nominally 2-μm-wide stripes on 24-μm centers in a buried-heterostructure configuration (produced by mesa-etching a three-layer double heterostructure and burying with an AlGaAs layer). By adjusting the mole fraction of Al in the burying layer, a negative-index step is produced at the lateral stripe boundary. Thus a substantial fraction of laser power leaks into the low-loss waveguide region between the stripes, and strong stripe coupling is observed. The far field consists of two collimated (divergence ∼1°) beams characteristic of leaky-mode operation that are stable to pulsed drive current as high as 6Ith. Linear output characteristics are observed to powers greater than 150 mW.
Ackley et al. (1980) studied this question.