液晶轴棱锥

Liquid Crystal Axicon

如何更加有效且简便地得到新型锥透镜及贝塞尔(Beasel)光束一直是研究人员关注的重点。提出了一种由液晶材料制作的锥度可由电压调整的轴棱锥。对所提出的液晶轴棱锥特性进行了介绍。此类液晶轴棱锥由两个电压控制,其中一个电压固定,通过改变另一个电压来改变轴棱锥锥度。对液晶轴棱锥特性进行了测试,实验结果表明液晶轴棱锥能够对入射光进行与传统轴棱锥相似的调制,并且实现锥度的连续变化。搭建了基于液晶轴棱锥的成像系统,并通过此系统实现了扩展景深成像。液晶轴棱锥为产生贝塞尔光束及扩展景深成像提供了新的思路与方法。

The ways to obtain new types of axicons and Bessel beams more effectively and easily have always been the focus of researchers.This paper proposes an axicon made of liquid crystal material with cone angle adjusted by voltage and introduces the characteristics of the proposed liquid crystal axicon.This type of liquid crystal axicon is controlled by two voltages,one of which is fixed,and the cone angle of the axicon is altered by changing the other voltage.The characteristics of the liquid crystal axicon are tested.The experimental results show that the liquid crystal axicon can modulate the incident light similar to the traditional axicon and realize the continuous change of the cone angle.Finally,an imaging system using a liquid crystal axicon is built,and the extended depth-of-field imaging is achieved by this system.The liquid crystal axicon provides new ideas and methods for generating Bessel beams and extending the depth of field.