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在利用晶体的电光效应实现快速变焦时,需要合理地设计电光晶体及电极结构。基于晶体电光效应的基本原理,提出了其设计的基本原则和思路,并通过对一次电光晶体(铌酸锂晶体)和二次电光晶体(钽铌酸钾晶体)内部非均匀电场及其总附加光程的模拟和比较,获得了优化的电光晶体及电极设计结果。在此基础上,开展了电光晶体用于快速变焦设计的性能分析,并讨论了电光晶体长度、外加电压等参数对总附加光程的影响。结果表明:电光晶体的附加光程调制的曲率半径随控制电压增大而减小,在加载电压不变的情况下随晶体厚度的增大而增大。因此,在实际应用中,需要对晶体厚度和加载电压综合进行考虑,以获得最佳的变焦效果。
When using the electro-optic effect of the crystal to realize fast zooming, it is necessary to design the electro-optic crystal and the electrode structure rationally. Based on the basic principle of crystal electro-optic effect, the basic principles and ideas of its design are put forward. By comparing the internal non-uniform electric field of primary electro-optic crystal (lithium niobate crystal) and secondary electro-optic crystal (tantalum potassium niobate crystal) The simulation and comparison of the optical path resulted in the optimized electro-optic crystal and electrode design results. On this basis, the performance analysis of electro-optic crystal for rapid zooming design is carried out. The effects of electro-optic crystal length, applied voltage and other parameters on the total additional optical path length are discussed. The results show that the curvature radius of additional optical path modulation decreases with the increase of the control voltage and increases with the increase of the crystal thickness under the same applied voltage. Therefore, in practical application, the thickness of the crystal and the voltage of the load need to be comprehensively considered in order to obtain the best zooming effect.