Low-divergence beams from grating-coupled composite guide heterostructure GaAlAs diode lasers

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Abstract
Room‐temperature operation of a new grating‐coupled heterostructure diode laser is reported. The laser contains two GaAs layers separated by a GaAlAs layer. One of the GaAs layers is electrically pumped, whereas the other is corrugated. Light is distributed over both layers and the grating couples out low‐divergence polarized beams approximately normal to the p‐n junction. Room‐temperature thresholds as low as 2 kA/cm2 have been observed.