超短脉冲数字全息术中的立体角分复用技术

Spatially angular multiplexing in ultra-short pulsed digital holography

将角分复用技术应用于超短脉冲数字全息术,可实现对超快过程的动态记录.其中,在角分复用的设计中,由于CCD像素尺寸的限制,一般对物光和参考光的角度要求较为苛刻.为此,提出了一种立体角分复用的方法,并使用连续激光数字全息实验验证了这种方法的有效性.在此基础上,根据超短脉冲数字全息术记录超快过程的特点,设计了能够实现自动连续进行立体角分复用记录的光路.计算分析表明,该光路可在一帧数字全息图上连续记录间隔为纳秒量级的多幅超快过程的动态图像.

Ultra-fast dynamic process can be recorded by ultra-short pulsed digital holography with .angular multiplexing technique, in which the angle between reference beam and object beam has to be restricted to within a few degrees due to the restricted pixel size of CCD in the recording. In this report, spatially angular multiplexing technique is introduced, and the its applicability has been proved through a simulation experiment of digital holography with CW laser. Besides, optical set-up based on this technique is designed. Computation result shows that a series of dynamic multi-images in nanosecond time scale of ultra-fast process can be automatically recorded on a piece of digital hologram.