Polarization-dependent optical gain and absorption spectra of (Cd,Mn)Te and (Zn,Mn)Se multiple quantum well structures

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Abstract
The absorption and gain spectra for TE and TM modes in (100) oriented (Cd,Mn)Te and (Zn,Mn)Se multiple quantum well (MQW) structures have been measured by observing the photoluminescence from a cleaved edge. In (Cd,Mn)Te MQW’s the TE mode absorption and gain are dominant, as observed earlier in (Ga,Al)As MQW’s; in (Zn,Mn)Se MQW’s, however, we observe a clear dominance of the TM mode near the band edge. Whereas the TE mode dominates the gain spectra of a (Cd,Mn)Te MQW, the TM mode dominates the gain spectra of a (Zn,Mn)Se MQW, providing the first report of TM-polarized stimulated emission from a MQW structure. The opposite behavior of (Cd,Mn)Te and (Zn,Mn)Se MQW’s is ascribed to the opposite sense of the uniaxial strain in these systems.