PbSrS/PbS double-heterostructure and multiple quantum well lasers were
prepared by hot wall epitaxy, and the dependence of the properties on
the cladding layer band gap and active layer thickness was investigat
ed. Output photon energy of the double-heterostructure laser shifted t
o the high energy side owing to the strain between PbSrS cladding and
the PbS active layers. The shift. decreased by increasing the PbS acti
ve layer thickness. It was estimated that the lattice mismatch between
cladding and the active layers is accommodated by the strain when the
PbS active layer thickness is as thin as 0.5 mu m.