BLEACHING OF EXCITONIC ABSORPTION IN II-VI LASER-DIODES UNDER LASING CONDITIONS

The lasing mechanism for II-VI laser diodes is studied with a novel pu mp-and-probe scheme that allows for probing the absorption spectrum un der actual lasing conditions, For high quality samples containing a 10 nm Zn1-xCdxSe single quantum well, the exciton is bleached for carrie r densities in the gain/lasing range in accordance with numerical solu tions of the semiconductor Bloch equations. Furthermore, emission spec tra are obtained for a sample within a cavity resonator, and the resul ts are in qualitative agreement with results obtained from a non-equil ibrium Green's functions theory for the coupled carriers and photons s ystem.