Effects of composition profile on characteristics of GaAs–Ga1−xAlxAs double-heterostructure lasers

Abstract
Electron probe x-ray microanalysis was used to measure the composition profile in the active layers of GaAs–Ga1−xAlxAs double-heterostructure wafers along the growth direction. The threshold current density and the lasing wavelength of the double-heterostructure laser were found to be consistently affected by the composition profile in the active layer.