Nonlinear Optical Properties of Perfectly Polarized KIO₃ Single Crystal

The nonlinear optical properties of a perfectly polarized KIO₃ single crystal were investigated. The principal refractive indices and nonlinear optical coeffi-cients have been measured. The results are as follows: n₁=1.6967, n₂ =1.8329, n₃=1.8358 for 0.5893μm; d₃₁=1.2 |d₃₁ (LiIO₃)|, d₃₂=1.8|d₃₁(LiIO₃)|. The in-tensity of the frequency-doubled light of the KIO₃ single crystal with 2.96rnm thickness is 1.2 times as large as that of the KTP single crystal with the same thickness.