An integrated coherent beam expander utilizing a transverse leaky mode waveguide has been integrated with a single mode distributed Bragg reflector laser and a preamplifier producing powers in excess of 70 mW cw in a single spectral and spatial mode across an aperture over 100 μm wide. The far-field pattern in the direction parallel to the plane of the p-n junction, consists of one main lobe 0.45° wide, indicating that the beam is coherent over the full emitting aperture. The expanded beam is suitable as an injection source for an integrated broad area amplifier.
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O’Brien et al. (1992) studied this question.
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