One of the IV-VI material systems that showed promising growth results is PbSe/Pb_0.934Sr_0.066Se quantum well structure with PbSe as the well material, and Pb_0.934Sr_0.066Se as the barrier material. However, this material system is a part of the lead salts semiconductor group with constant energy surfaces that are prolate ellipsoids of revolution and its energy bands are highly non-parabolic. The effects of the prolate ellipsoids of revolution are studied using the isotropy of the effective mass. Using these effective masses, we study the effects of non-parabolicity on the energy level and emitted wavelength calculations for the normal and oblique degenerate valleys of the system. The theoretical results are compared with the experimental ones for the first two energy levels and a close match is found.

anisotropy, degeneracy, lead salts, mid-infrared.