Surface‐emitting distributed feedback semiconductor laser

Electrically pumped, surface‐emitting distributed feedback lasers were for the first time demonstrated without any facet reflections. The devices contained second‐order gratings etched into a thin p‐AlGaAs cladding layer surface. A gold ohmic contact deposited directly onto the p‐AlGaAs grating surface provided strong coupling to the waveguide mode. Single spatial mode devices with low divergence output beams and single frequency spectra were obtained at room temperature.

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