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介绍了相位型全息聚合物分散液晶(PDLC)材料全息透镜,在电场作用下液晶微滴折射率逐渐与聚合物折射率匹配,实现透镜电控变焦。研究了微米尺寸和纳米尺寸液晶微滴聚合物分散液晶材料配方特性和微观结构。采用优化纳米尺寸材料配方制作5~6μm聚合物分散液晶盒,采用离轴式平面波和球面波干涉全息写入光路,成功制作电控变焦聚合物分散液晶全息透镜样品。该透镜样品焦距为20 mm,能够正一级衍射放大成像。实现“0”,“1”变焦的驱动电压阈值为60 V。并进一步提出了基于聚合物分散液晶电控变焦元件集成叠加技术实现电控变焦光学成像系统的技术思路。
The phase holographic polymer dispersed liquid crystal (PDLC) material holographic lens is introduced. The refractive index of the liquid crystal droplet gradually matches the refractive index of the polymer under the action of an electric field to realize the electronically controlled zooming of the lens. The properties and microstructure of liquid crystal material with micron size and nanometer size liquid crystal droplet dispersion were studied. A 5 ~ 6μm dispersion liquid crystal cell was fabricated by optimizing the nanometer size material formula. The off-axis plane wave and spherical wave interference holographic writing light path were used to fabricate electronically controlled zoom polymer dispersed liquid crystal holographic lens sample. This lens sample has a focal length of 20 mm and is capable of positive first-order diffractive magnification imaging. The driving voltage threshold for “0” and “1” zooming is 60 V. And further proposed based on polymer dispersed liquid crystal controlled zoom components integrated superposition technology to achieve electronically controlled zoom optical imaging system technology.