Acceptable composition-ratio variations of a mixed crystal for nonlinear laser device applications.

A theory is developed to predict some crucial parameters that optimize the performance of mixed nonlinear crystals in nonlinear devices. These include acceptable variations of the composition ratio of the parent crystals and the optimal as well as acceptable interaction lengths for any interaction. The theory is successfully applied to make necessary predictions for the newly developed LiIn(Se(x)S(1-x))2 crystal for second-harmonic and optical parametric generation.