Thermal dependence of the principal refractive indices of lithium triborate

The thermal dependences of the principal refractive indices of lithium triborate (LBO) have been measured over an extended temperature range of 20–200 °C with a Michelson interferometer. The data obtained are critically evaluated by prediction of the temperature dependences of phase matching and the temperature bandwidth of LBO in a wide range of circumstances (which include optical parametric oscillation, second-harmonic generation, and sum-frequency-mixing generation), and close agreement with experimental observation is obtained in most cases.