Conversion of the frequency of laser radiation in lithium triborate LiB3O5 crystals

Optical and nonlinear optical properties of LiB₃O₅ single crystals grown from a molten solution were investigated. Experiments yielded the directions along which phase-matched generation of the second and third harmonics of garnet laser radiation was possible. The parameters of generation of the second harmonic of YAG laser radiation were determined at room temperature and at a temperature of noncritical phase matching. The experimental results were used to determine the mutual orientation of crystallographic and crystallophysical coordinate systems.