755 nm InP/GaAsP quantum dot laser with polarization-dependent emission from type-I and type-II band alignments.

InP/GaAsP quantum dot (QD) lasers with variable polarization are demonstrated through the tailoring of band alignment. Different band alignments of type-I and type-II are realized during QD growth with varied parameters. The energy shift of type-I structure is observed to be much lower than that of type-II.