Abstract
Multiquantum well structures of GaSb/Al0.6Ga0.4Sb were grown by molecular beam epitaxy and their spontaneous and stimulated emission properties were studied. The luminescence spectra exhibited high efficiency with the upward energy shift from λ=1.72 μm of GaSb up to λ=1.31 μm for the well width of ∼40 Å. Optically induced lasing has been obtained at the wavelength as short as λ=1.207 μm at 80 K and in the spectral region of λ=1.5–1.6 μm at temperatures as high as 80 °C. The optical thresholds of the quantum well lasers are similar to that of the more conventional GaSb/AlGaSb heterostructures.