Study On The Properties Of Controlled Beam Deflection Of Barium Titanate Crystal

Currently information era of rapid development has required us to create and develop in communication field.It not only satisfies the needs of our daily life,but also can create our revival of nation.People have studied optical communication many years,especially the research of beam deflection,which is the hot topic of optical communication field.Materials and styles have attracted to people’s interest many years,so they create and study its development continuously.Beam deflection based on electro-optical materials has developed rapidly,many of which have been studied by people in the field.People have put their endeavor into the style and deflection range of beam deflection.Barium titanate crystal（called BaTiO₃ crystal）,is a style of ABO₃ of typical perovskite materials,which also belongs to ferroelectric materials and possesses many excellent properties,such as ferroelectricity,dielectricity,piezoelectricity and nonlinear optical property.There are not many studies available now about beam deflection based on BaTiO₃ crystal,but BaTiO₃ crystal,as an electro-optical material of mature growth techniques and excellent performance,should show its first-class performance in beam deflection field.This paper has mainly studied how to obtain beam deflection based on the temperature effect and electro-optic effect of BaTiO₃ crystal and achieve the goals of low loss,low cost and rapid response.Firstly,this paper has conducted theoretical analysis the relations of refractive index and temperature and the relations of its electro-optic effect about BaTiO₃ crystal.According to the understanding of its electro-optic effect,we design the distribution of electric field and achieve beam deflection in theory and finish creation in theory.Secondly,we fabricate the experimental setup,which concludes hot plate and cold plate and temperature-controlled meter.The experimental setup we design can control the distribution of temperature in high precision.We can achieve stable beam deflection by putting BaTiO₃ crystal onto the setup.Compared with other materials based on temperature-controlled effect,this paper can achieve the goals of high temperature-controlled precision and the high precision of beam deflection.We can also set the parameters beforehand and simplify the experimental process.This paper has also tested the graded distribution of temperature and the results conform to the theoretical values.The 1-D and 2-D system of splitting beam have been fabricated by the above experiment setup and obtain precise phenomenon of splitting beam.Finally,we have designed the styles of the electrodes of the samples of BaTiO₃ crystal and fabricated the graded distribution of electric field.Beam deflection basedon the pure BaTiO₃ crystal can be achieved by the electro-optic effect of BaTiO₃ crystal.When the distribution of electric field can be simulated by software Comsol,we can learn more about it and the results are same to the theoretical values.At the last of this paper,we have combined temperature-controlled setup with electric-field-controlled setup and the range of beam deflection can be enlarged again.We have gotten the theoretical values of the temperature’s impact on the refractive index and the electro-optical coefficient of BaTiO₃ crystal.The theoretical values can be achieved by the experiments.Therefore,we have finished the study of controlled beam deflection based on BaTiO₃ crystal.This paper can provide a stable electro-optical material for beam deflection field,and increase alternatives for application field.The study of temperature-controlled style can help people understand temperature effect’ function on beam deflection well.Designing the electrodes of BaTiO₃ crystal creatively can achieve beam deflection based on BaTiO₃ crystal and offer a novel style of deflection.This paper have significant implication for the development of beam deflection field.