GaAs/AlGaAs buried channel stripe lasers by single-stage MOCVD on V-grooved substrates

A well-defined selective GaAs epilayers were successfully grown on V-groove d GaAs substrates by single-stage atmospheric pressure metalorganic chemica l vapor deposition (MOCVD) by supplying carbon tetrabromide (CBr4) and carb on tetrachloride (CCl4). Inside the V-grooves, the selectively grown GaAs e pilayers exhibited a triangular and a round shape by supplying CBr4 and CCl 4, respectively. By using this single-stage selective epitaxial growth tech nique, GaAs/AlGaAs buried channel stripe lasers with a GaAs active layer co mpletely embedded in AlGaAs barriers were obtained. Room temperature operat ion was achieved at a wavelength of 869 nm with threshold currents as low a s 43.5 mA (pulsed) and 59.9 mA (CW) for a 250 mu m-long uncoated cavity.