Relaxation time broadening on emission spectrum of a Zn-doped p-type GaAs injection laser

Abstract
Spontaneous emission and lasing gain profiles of semiconductor injection lasers which have Zn-doped GaAs active regions were experimentally determined, and the tailing phenomenon into the band gap of these profiles was theoretically explained as a result of relaxation time broadening due to scattering of electrons and holes. Especially, the tail of the gain profile was found to show a concave shape, which was better explained by the relaxation time broadening model than by the band tail state model.