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UV directly written waveguide procedure in lithium niobate single crystals has held considerable promise because of its single-step process which is well suited for complex micro-optical devices, in addition to the conventional optical integrated circuits. For most applications, single-mode waveguides are essential in order to achieve optimised device performance, and hence the determination of single-mode...
The development of methods for ferroelectric domain engineering in lithium niobate (LN) is of special importance as it not only enables the fabrication of efficient non-linear devices (PPLN) but also constitutes a very effective path towards micro-structuring of this important ferroelectric crystal. UV laser-induced poling inhibition is a process whereby domain inversion is prohibited as a result...
Thermal treatment of micro-structured lithium niobate, at temperatures close to the Curie point, induces preferential surface melting and re-crystallization. This process yields ultra-smooth single crystal superstructures suitable for fabrication of low scattering loss photonic micro-components.
Continuous wave UV laser (lambda = 244 nm) irradiation of the +z face of lithium niobate single crystals inhibits ferroelectric domain inversion in the volume of the crystal which lies immediately below the UV exposed surface.
Back-propagation artificial neural network and response surface methodology were used to build a predictive model of the combined effects of molecular distillation's independent variables including evaporating temperature, feed flow rate and wiper rolling speed for the recovery of tocopherol from rapeseed oil deodorizer distillate. The optimum operating conditions obtained from the quadratic form...
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