PbTe/PbS Multilayer Mirror for EuTe/PbTe Surface Emitting Quantum Cascade Lasers

Abstract

A PbTe/PbS multilayer mirror was prepared by Hot Wall Epitaxy. A reflectivity as high as 99% in the mid infrared region was obtained using about seven periods of the multilayer structure, owing to the relatively large difference in the refractive index of PbTe and PbS. Such a mirror has potential applications for electrically pumped EuTe/PbTe vertical cavity surface emitting quantum cascade lasers.