摘要
针对大物体数字全息记录时记录距离太长的问题,提出了一种实现短距离、大物体数字全息的记录系统。该系统将大物体预先缩小成像技术、两步相移技术引入到同轴无透镜傅里叶变换全息记录光路中。结果表明:同轴无透镜傅里叶全息可以充分的利用CCD的带宽,减少记录距离;两步相移技术操作简单,有效去除了零级像和共轭像的干扰;预缩小成像技术可以使得记录距离进一步减少,以上三种技术相结合,实现了在较短距离内,记录大物体的数字全息。
A new system for the reeoding of large objects in digital holography is presented. The system introduces the demagnification image technique and two steps phase - shifting technique to in - line lens - less Fourier transform holography. The results show： In - line digital holography can make use of the bandwidth of CCD, and decrease the recording distance; Two steps phase - shifting technique can effectively delete the zero order and the conjugate image by simply operation; Demagnification image technique can further decrease the recording distance. Combination with above three techniques, the recording of lager objects in digital holography with less distance is realized.
出处
《激光杂志》
CAS
CSCD
北大核心
2013年第3期21-22,共2页
Laser Journal
关键词
数字全息
大物体
预缩小成像
两步相移技术
Digital holography
large object
demagnification image technique
two steps phase- shifting technique
