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当前,传统光学元件正向着小型集成化和性能可调控的方向前进,但传统透镜系统体积大,变焦速度慢,稳定性不强,严重制约了光学元件的研究发展。因此拥有体积小,可高速调焦的透镜系统成为当前的研究热点。本文立足于对可变焦微透镜的设计,采用锰掺杂钽铌酸钾钠(Mn:KNTN)晶体的电控特性,发挥其光电系数大、衍射效率高等优点,从理论出发,建立模型,给出在不同外加电场情况下,晶体焦点的变化,从而实现电控高速变焦。同时,利用MATLAB计算软件,对理论模型进行计算模拟,给出不同外加场情况下焦点位置的变化。本文的研究对推进高速变焦透镜的小型化和实用化具有重要意义。
At present, the traditional optical components are moving in the direction of small-scale integration and performance control. However, the traditional lens system is bulky, slow in zooming speed and poor in stability, seriously restricting the research and development of optical components. Therefore, having a small, high-speed focusing lens system has become the current research focus. Based on the design of variable focal microlenses, the electronic controlled characteristics of Mn-doped tantalum sodium niobate (Mn: KNTN) crystals are used to develop their large photoelectric coefficient and high diffraction efficiency. Based on the theory, In the case of different external electric field, the crystal focus changes in order to achieve high-speed electronic control zoom. At the same time, MATLAB software is used to calculate and simulate the theoretical model, and the change of focus position under different external fields is given. The research in this paper is significant to promote miniaturization and practicality of high-speed zoom lens.