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研究了一种采用蝶形液晶开关获得柱透镜式定向背光横向平顶光束的原理和方法,在广义惠更斯-菲涅耳衍射积分理论的基础上,推导出以蝶形液晶开关单元为光源的光束经柱透镜后的衍射光场分布表达式;将蝶形液晶开关单元置于柱透镜的物方焦平面上,利用MATLAB编程模拟不同焦距柱透镜下的横向光场能量分布曲线,并分析了蝶形参数对横向光场能量分布的影响。结果表明,随着蝶形参数减小,横向衍射光场能量均匀度先增大后减小,存在一个蝶形参数值可使能量均匀度达到最大值。
Based on the theory of generalized Huygens-Fresnel diffraction integral, a butterfly-shaped liquid crystal switch unit is proposed as a light source Of the light beam through the cylindrical lens after the diffraction field distribution expression; the butterfly liquid crystal switch unit is placed on the cylindrical lens focal plane of the object, the use of MATLAB programming simulation of different focal length lens lateral field energy distribution curve and analysis Influence of Butterfly Parameters on Energy Distribution in Transverse Light Field. The results show that with the decrease of the butterfly parameters, the energy uniformity of the transverse diffraction field first increases and then decreases, and a butterfly parameter value can make the energy uniformity reach the maximum.