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在同轴相移数字全息实验中 ,相移量的准确性、稳定性对实验结果起着很重要的作用 ,因此相移器的研究已成为相移数字全息实验研究中的一个重要内容。在以往应用的相移器中 ,大多是通过机械驱动改变光程来实现相移 ,这种方法会使光路变得复杂。提出了一种新型的相移器———液晶光调制计算全息相移器 ,它将大大简化光路的设计 ,同时避免机械运动 ,实现相移量的全数字化控制。该相移器是基于计算全息原理和傅里叶变换的位移定理所提出的 ,它将液晶显示器 (LCD)作为光学显示元件 ,通过适当改变显示在液晶显示器上的计算全息图的编码 ,使其同时实现波面变换和相移。给出了液晶光调制计算全息相移器的理论分析 ,并通过实验测量表明其相移量的波动范围仅在 0 .0 36rad以内 ,具有很高的精确性、可重复性和稳定性 ,最后验证了该相移器用于同轴相移数字全息实验的可行性。
In the experiment of coaxial holographic digital holography, the accuracy and stability of the phase shift amount plays an important role in the experimental results. Therefore, the research of phase shifter has become an important part in the research of phase-shift digital holography. In the past application of phase shifter, mostly through the mechanical drive to change the optical path to achieve the phase shift, this approach will make the optical path becomes complicated. A new type of phase shifter --- liquid crystal optical modulation holographic phase shifter is proposed, which will greatly simplify the design of optical path and avoid the mechanical movement at the same time. The phase shifter is based on the calculation of the holographic principle and the Fourier transform of the displacement theorem put forward the liquid crystal display (LCD) as an optical display element, by appropriately changing the code displayed on the liquid crystal display computing hologram, make it At the same time to achieve wave transformation and phase shift. The theoretical analysis of the liquid crystal optical modulation holographic phase shifter is given, and the experimental measurement shows that the phase shift of the holographic phase shifter is within the range of 0.036 rad, with high accuracy, repeatability and stability. Finally, The feasibility of the phase shifter for coaxial holographic digital holography experiments is verified.