High-power fundamental-transverse-mode strip buried heterostructure lasers with linear light-current characteristics

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Abstract
A new laser structure, the strip buried heterostructure (SBH) laser, using an active layer strip 2.5 to 10 μm in width, on a low‐loss waveguide is described. Typical test results with pulsed injection, for a 5‐μm strip width, show stable fundamental‐transverse‐mode operation linear light‐current characteristics up to 15 times threshold where the power output is 230 mW/mirror (without AR coating). Single‐longitudinal‐mode oscillation has also been observed up to twice threshold. Far‐field beam divergence of 8°–10° and 26°–30° was obtained in directions parallel and perpendicular to the junction plane, respectively.