Nonlinear optical refraction characteristics of rapidly grown K(D x H1− x )2PO4 crystals

A series of K(D x H1− x )2PO4 (DKDP; x = 0, 12, 70, and 80%) crystals were grown using the point-seed technique. A positive nonlinear refractive index is exhibited, implying a self-focusing effect. The nonlinear refraction along the z-direction is greater than that along the II-direction, indicating that the distribution of the H2PO4 − and D2PO4 − groups have a critical influence on the nonlinear refraction. The nonlinear refraction effect of "point-seed" crystals is greater than that of traditional growth crystals, demonstrating that the crystalline quality is a major factor. Compared to the pyramid region, the prism region has a larger nonlinear refraction effect. The vital parameters n 2 and have been calculated and the results allow for DKDP applications.