双Lloyd镜数字全息显微测量术  

Digital holographic microscope employing dual-Lloyd's mirror

作　　者：袁飞[1] 袁操今[1] 聂守平[1] 朱竹青[1] 马青玉[1] 李莹[1] 朱文艳[1] 冯少彤[1] 

机构地区：[1]南京师范大学江苏省光电技术重点实验室,南京210023

出　　处：《物理学报》2014年第10期162-166,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61377003;11274176)资助的课题~~

摘　　要：提出了一种双Lloyd镜数字全息显微测量技术.其基本思想是将Lloyd镜的共光束自干涉特性与双波长光学相位解包裹方法相结合,使用两个Lloyd镜调节参考光与物光夹角以形成共光束自干涉,从而获得一张双波长复合全息图,再通过角谱法再现得到每个波长对应的包裹相位,利用两波长的相位差求得解包裹后的相位图和三维高度分布图.采用532和632 nm两波长记录全息图,通过数值再现重构被测物体的振幅和相位信息.与标定值相比,实验值的误差小于5%,证明了该方法的有效性.We propose a digital holographic microscopy （DHM） setup employing a configuration with two Lloyd＇s mirrors, which is based on self-referencing and dual-wavelength optical phase unwrapping. We use two Lloyd＇s mirrors to fold the beam which does not exhibit sample structure and acts as the reference beam, returning onto itself to form a dual-wavelength hologram. Two wrapped phase images for every wavelength are reconstructed by angular spectrum method. Then the wrapped phase image and the three-dimensional profile image are acquired by dual-wavelength optical unwrapping method. In the experiment, we use two lasers of different wavelengths of 532 and 632 nm to record a hologram. Numerical methods are subsequently applied to reconstruct the hologram to enable direct access to both phase and amplitude information. The quantitative experimental results with dual-wavelength DHM involve a deviation less than 5% from the calibration values. The validity of this method is demonstrated.

关 键 词：全息 双波长数字全息 光学相位解包裹 Lloyd镜 

分 类 号：O438.1[机械工程—光学工程]