Refractive indices of KD_2xH_2(1–x)PO₄and RbD_2xH_2(1–x)PO₄crystals

Abstract

The refractive indices of KD2xH2(1–x)PO4 and RbD2xH2(1–x)PO4 crystals decrease linearly with increasing x. Empirical dependences of the refractive indices for ordinary (n0) and extraordinary (ne) waves on the value of x are reported. It is shown that these dependences are related to an increase in the lattice parameters and reduction in the polarizability along the crystallographic X axis. The dependences obtained can be used in the design of frequency doublers and deflectors of laser radiation.