控制液晶器件产生的程控透镜和微透镜阵列

研究了计算机程控光学器件的性能。通过对液晶空间光调制器进行电寻址控制,得到了振幅模式、二进制相位模式和连续相位模式的计算机程控透镜和程控微透镜阵列。实验结果和计算分析都表明,连续相位模式的程控透镜具有较好的聚焦性能和光效率。程控微透镜阵列的优点是阵列中的每一个微透镜都可以单独控制,可以得到所需要的阵列形式。实验给出了一个由这样的微透镜阵列产生的去掉了中心4×4阵列的8×8光斑阵列样式。还给出了利用程控透镜来方便有效地演示和研究透镜的像差方法。由计算机控制空间光调制器得到的光学器件虽然具有极大的灵活性,但是由于空间光调制器的像素的尺寸影响了它的精细程度,限制了它的应用。

Programmable Lens and Lenslet Array by Operating a Liquid Crystal Device

The property of the computer programmable optical devices is investigated. The programmable lenses have been performed by operating an electrically addressable liquid crystal spatial light modulator (LC-SLM) in amplitude mode, binary phase mode, and continuous phase mode. The programmable lenslet arrays have also been carried out experimentally. Both the experimental and calculating results show that the continuous phase mode provides the best results in terms of both light efficiency and focus quality. The advantage of the programmable lenslet array over the conventional one is that each lenslet in the array can be controlled individually. An 88 array mode without the central 44 light spot array generator has been demonstrated experimentally. The programmable lens was also implemented as a convenient way of investigating the aberration of the lenses experimentally. Although the computer programmable LC-SLM device has its great flexibility, its finite pixel size limits its fineness and, therefore, limits its applications.