Evidence of no k-selection in gain spectra of quantum well AlGaAs laser diodes

It is suggested, contrary to present views, that the processes giving rise to radiation in undoped or lightly doped quantum well laser diodes can be described by using a no k -selection model. The reason is contained in the good fit of experimental gain spectra which we obtain on the basis of this assumption. This does not rule out the possibility that spectra can, in principle, be obtained in the future which are subject to the strict k -selection rule.