Optical absorption and stimulated emission in ultrathin single quantum wells

Abstract Stimulated emission from a series of ultrathin AlGaAsGaAs separate confinement single quantum well structures is demonstrated, under various photo-excitation energies both above and below the confining layer band edge. It is shown that a single ultrathin quantum well as thin as nine monolayers ( L Z = 25 A ) has sufficient absorption to support stimulated emission.