Min Junwei, Yao Baoli, Gao Peng, Guo Rongli, Ma Baiheng, Zheng Juanjuan, Lei Ming, Yan Shaohui, Dan Dan, Duan Tao, Yang Yanlong, Ye Tong
State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China.
Appl Opt. 2012 Jan 10;51(2):191-6. doi: 10.1364/ao.51.000191.
We propose dual-wavelength digital holographic microscopy with a slightly off-axis configuration. The axial measurement range without phase ambiguity is extended to the micrometer range by synthesizing a beat wavelength between the two wavelengths with separation of 157 nm. Real-time measurement of the specimen is made possible by virtue of the high wavelength selectivity of the Bayer mosaic filtered color CCD camera. The principle of the method is exposed, and the practicability of the proposed configuration is demonstrated by the experimental results on a vortex phase plate and a rectangular phase step.
我们提出了一种具有轻微离轴配置的双波长数字全息显微镜。通过合成两个波长之间间隔为157nm的拍频波长，无相位模糊的轴向测量范围扩展到了微米范围。借助拜耳彩色滤光片阵列过滤的彩色电荷耦合器件相机的高波长选择性，实现了对样品的实时测量。阐述了该方法的原理，并通过对涡旋相位板和矩形相位台阶的实验结果证明了所提出配置的实用性。
