Titanosilicates with Strong Phase-Matched Second Harmonic Generation Responses

Tzu Ling Chao, Wen Jung Chang, Shu Han Wen, Yu Qing Lin, Bor Chen Chang, Kwang Hwa Lii

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39 Scopus citations

Abstract

The search for new and efficient nonlinear optical (NLO) materials has been an active research because of their technological importance in laser applications. Although a large number of frequency-doubling oxides, phosphates, borates, and fluoride-containing borates were found, no transition-metal silicate with useful NLO properties has been reported. We have now synthesized and grown crystals of two new titanosilicates, Li2K4[(TiO)Si4O12] and Li2Rb4[(TiO)Si4O12], by using a flux and supercritical hydrothermal method. Their unique 3D framework structures contain highly compressed TiO5 square pyramids which are arranged one over the other to form infinite ···Ti-O···Ti-O straight chains with alternating short and long Ti-O distances. These two materials meet the requirements for efficient second harmonic generation including lack of center of inversion symmetry, large susceptibility, phase matching, transmitting at wavelengths of interest, resistant to laser damage, and thermally stable. These attributes make them very attractive for frequency-doubling materials.

Original languageEnglish
Pages (from-to)9061-9064
Number of pages4
JournalJournal of the American Chemical Society
Volume138
Issue number29
DOIs
StatePublished - 27 Jul 2016

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