780 nm oxidised vertical-cavity surface-emitting lasers with Al/sub 0.11/Ga/sub 0.89/As quantum wells

Low threshold vertical-cavity surface-emitting lasers with Al/sub 0.11/Ga/sub 0.89/As four quantum wells for 780 nm wavelength emission are fabricated using aluminum oxide apertures. The fabrication process requires only single step mask alignment. The 3.4 /spl mu/m square laser exhibits a low threshold current of 200 /spl mu/A, which is more than an order of magnitude smaller than the previous values obtained at 780 nm. Singlemode peak output power is 1.1 mW. This 3.4 /spl mu/m laser is found to operate in the fundamental transverse mode over the complete operating current range. The 7.6 /spl mu/m square laser shows peak output power of 2.7 mW.