InGaAsP/InGaP buried heterostructure lasers emitting at 810 nm have been grown on GaAs substrates using two‐step liquid‐phase epitaxy. A threshold current of 79 mA and an external differential quantum efficiency of 26% are obtained. Fundamental transverse mode operation up to 3 mW is achieved in the laser with the active region of 3.5 μm wide.

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