Visible AlGaAs single quantum well lasers with low threshold current density grown by molecular beam epitaxy

The letter reports short wavelength emission (7205 AA) from MBE AlGaAs GRINSCH single quantum well lasers. Visible emission is obtained with a 60 AA AlGaAs well containing approximately=18% aluminium and both design optimisation and growth conditions lead to low-threshold operation. Broad area Fabry-Perot diodes have threshold current densities as low as 390 A/cm/sup 2/ and 670 A/cm/sup 2/ for cavity lengths of 500 mu m and 250 mu m, respectively. >