Lead-strontium-telluride films and lasers prepared by hot-wall epitaxy

Pb 1- x Sr x Te films were prepared by hot-wall epitaxy on BaF 2 (111) substrates. X-ray diffraction analysis, optical transmission measurement, Hall measurement and electron-probe micro-analysis (EPMA) were performed for the films. It was observed that the increasing rate of the lattice constant of the Pb 1- x Sr x Te films with the SrTe content was considerably larger than that estimated from Vegard's law. Pb 1- x Sr x Te/PbTe double-heterostructure (DH) and multiple-quantum-well (MQW) lasers were also prepared for the first time by hot-wall epitaxy. Pulsed laser operations were obtained up to 227 K (4.1 µ m) for the DH laser and up to 220 K (3.5 µ m) for the MQW laser. Large output energy shifts due to misfit strain in the active layer were observed.