2ND-HARMONIC GENERATION IN THE CRYSTALLINE COMPLEX ANTIMONY TRIIODIDE - SULFUR

Crystals of the 1:3 complex between antimony triiodide and sulfur, SbI3 * 3S8, are found to possess a high second-order optical nonlinearity. The powder second-harmonic generation efficiency is found to be approximately half of that of the isostructural complex of iodoform with sulfur, CHI3 * 3S8. Second-harmonic generation can be phase matched. The phase-matching angle of type I is found to be approximately 30-degrees at the fundamental wavelength 1.064 mum. The Maker fringes' measurements give chi222(2) congruent-to 16 pm/V, chi333(2) congruent-to 23 pm/V, and chi311(2) congruent-to 15 pm/V for the values of the components of the second-order susceptibility tensor. The third-rank hyperpolarizability tensor beta was decomposed into irreducible parts; the norms of the vector part and the septor (octupolar) part in the SbI3 * 3S8 complex were evaluated to be beta(v) = 52.1 X 10(-40) m4/V and beta(s) = 20.2 X 10(-40) m4/V, respectively.