Awatsuji Yasuhiro, Fujii Atsushi, Kubota Toshihiro, Matoba Osamu
Department of Electronics and Information Science, Kyoto Institute of Technology, Matsugasaki, Japan.
Appl Opt. 2006 May 1;45(13):2995-3002. doi: 10.1364/ao.45.002995.
We propose parallel three-step phase-shifting digital holography as a technique capable of noiseless instantaneous measurement of three-dimensional objects based on phase-shifting interferometry. The proposed digital holography carries out three-step phase shifting at the same time by using a phase-shifting array device located in the reference beam. The array device has a periodic three-step phase distribution, and its configuration is simplified compared with that required for conventional parallel phase-shifting digital holography. Therefore the optical system of the proposed parallel phase-shifting digital holography is more suitable for the realization of the proposed holography. We conduct both a numerical simulation and a preliminary experiment. The results of the simulation and experiment agree well with those of the conventional phase-shifting method and are superior to the results obtained by conventional digital holography by using the Fresnel transform alone. Thus the effectiveness of the proposed technique is verified.
我们提出并行三步相移数字全息术，作为一种基于相移干涉测量法能够对三维物体进行无噪声瞬时测量的技术。所提出的数字全息术通过使用位于参考光束中的相移阵列装置同时进行三步相移。该阵列装置具有周期性的三步相位分布，并且与传统并行相移数字全息术所需的配置相比得到了简化。因此，所提出的并行相移数字全息术的光学系统更适合于实现所提出的全息术。我们进行了数值模拟和初步实验。模拟和实验结果与传统相移方法的结果吻合良好，并且优于仅使用菲涅耳变换的传统数字全息术所获得的结果。从而验证了所提出技术的有效性。
