 BATIO3 is a technologically relevant material with above-room temperature ferroelectricity and a very large electro-optical coefficient, making it highly suitable for emerging electronic and photonic devices. Hybrid molecular beam epitaxy, HMB, was used to grow epitaxial BATIO3 thin films with sufficient control over the film stoichiometry to achieve reproducible thin film properties. The growth process was optimized through complementary information obtained from reflection high-energy electron diffraction, the intrinsic film lattice parameter, film surface morphology, and scanning transmission electron microscopy. Optical characterization of the BATIO3 films revealed refractive index and extinction coefficient values close to those of stoichiometric bulk BATIO3 crystals. In addition, the presence of defect states in the films was detected, resulting in a decrease in their optical properties. This study demonstrates the potential of HMBE for growing high-quality epitaxial BATIO3 thin films with controlled stoichiometry and optical properties. This article was authored by Benazir Fazliagli-Yeltsin, Albert C. Susiava, Tatyana Kuznetsova, and others.