SHG Tuning In The KTP Structure Field

Mark L. F. Phillips; William T. A . Harrison; Thurman E. Gier; Galen D. Stucky

doi:10.1117/12.960598

25 September 1989 SHG Tuning In The KTP Structure Field

Mark L. F. Phillips, William T. A . Harrison, Thurman E. Gier, Galen D. Stucky

Proceedings Volume 1104, Growth, Characterization, and Applications of Laser Host and Nonlinear Crystals; (1989) https://doi.org/10.1117/12.960598
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

Abstract

Potassium titanyl phosphate (KTP) has been shown to be a premier material for optical frequency second harmonic generation (SHG). Monovalent cations covering a large size range, e.g. Na⁺, Ag⁺, T1⁺, Rio⁺, and Cs⁺, have been used to partially or completely replace K⁺ in KTiOPO₄ or KTiOAsO₄, causing subtle structural variations which are frequently accompanied by marked changes in the nonlinear optical properties of these materials. The syntheses of (Na,K)TiOPO₄ and (NH4,K)TiOAsO₄, both by direct methods and by ion exchange with KTP and KTA are described here, and SHG intensities as a function of composition are presented. In the (Na,K)TiOPO₄ phase space, powder SHG intensity initially remains constant with sodium content, then drops by a factor of ten when the KTP isostructure NaTiOPO₄ is reached. In the (K,NH₄)TiOAs0₄ system, SHG intensity is reduced by a factor of 5 between 40 and 50 mole percent NH₄⁺. Single crystal X-ray data were collected on the compositions K_.5(NH4)_.5TiOAs0₄ (KNTA) and NaTiOPO₄ (NaTP). In KNTA, refinement reveals little change in the Ti coordination environment, however, unlike K.5(NH₄)_.5Ti0PO₄, no selective siting of the potassium and ammonium ions occurs. In NaTP, it is found that one of the Ti-O-Ti bond angles is reduced to 1300, and that one of the sodium atoms has the unusually low coordination number of four. KTixGa_1-x0xPO₄(F,OH)_1-x is isostructural with KTP, with ▵(Ga-0)trans bond length differences of 0.056 and 0.027Å. Preliminary studies of the compositional dependence of SHG in the system KTi_xGa_1-x0_xPO4(F,OH)_1-x show that SHG drops by 2 orders of magnitude between 50% and 60% Ga substitution.

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Mark L. F. Phillips, William T. A . Harrison, Thurman E. Gier, and Galen D. Stucky "SHG Tuning In The KTP Structure Field", Proc. SPIE 1104, Growth, Characterization, and Applications of Laser Host and Nonlinear Crystals, (25 September 1989); https://doi.org/10.1117/12.960598

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