A Study Of The Two-dimensional Hexagonal Phase Array Optical Beam Splitter Modulated By External Electric Field

Array beam splitter is an extremely widely used micro-optical device, it plays an important role in the field of optical communications and optical computing. With the development of integrated optics, the performance and size of the optical device are asked to be higher requirements. Array beam splitter based on Talbot effect has been found that can meet these requirements because of its well played on beam split, simple preparation process and easily integration, what has become one of the main array devices.As a good nonlinear optical ferroelectric material, lithium niobate (LiNbO3) crystal is always used to fabricate arrays beam splitter, which can successfully tune array’s phase differences under the action of external electric field. As a result, it eliminates the negative impact of ambient temperature for the array device, and also enhanced the performance of the array beam splitter and its diffraction imaging effect. In this paper, theoretical and experimental researches on tunable phase difference phase arrays base on Talbot effect of LiNbO3were presented. The main contents are as follows:1. This paper introduced the basic theories of array beam splitter, including the applications, types and the research progress of the array beam splitter based on Talbot effect.2. A theory research on Talbot effect array beam splitter is given, based on what we established a theoretical model of Talbot phase array beam splitter modulated by external electric field. Furthermore, it also calculated and analyzed the diffraction imaging maps of Talbot effect arrays.3. Based on the research, the two-dimensional hexagonal of Talbot effect phase array optical beam splitter is designed and fabricated. Through experimental test, the Talbot effect diffraction imaging map is successfully obtained, which verified the results of the simulation well. Meanwhile, the summary of the laboratory preparation of array beam splitter is also given.4. Wavelength of532nm semiconductor green laser light source is used; modulation of the backcourt uniform light intensity distribution of array beam splitter with a lower voltage (0~1500V) in experiment is successfully achieved. Comparison of the imaging effect between Talbot phase arrays base on congruent LiNbO3and MgO doped LiNbO3is also given.