光学学报, 2012, 32 (7): 0709001, 网络出版: 2012-05-18
Stokes参量数字全息法实现相位物体成像
Imaging Phase Objects by Digital Holography with Stokes Parameters
摘要
为实现对相位物体的无损检测和成像,克服数字同轴全息相位物体成像技术在消除零级像和孪生像的干扰时存在的系列问题,提出一种基于Stokes参量的新的数字同轴全息技术。该方法区别于传统的利用干涉光场来记录原始像项的数字全息方法,通过测量物参光合成光束的Stokes参量来分别得到这两束光的振幅和相位差,从而准确、唯一地获得原始像项;再利用数字再现即可重构物光的振幅和相位信息。实验中对弱吸收的相位样品进行了测量,得到样品清晰的振幅和相位分布。结果表明,采用该方法对相位物体进行数字全息再现,可以克服传统同轴全息图中零级像和共轭像对相位物体信息的严重干扰,对于提取相位物体的振幅和相位信息是可行和有效的。
Abstract
In order to achieve nondestructive testing and imaging of phase objects, and overcome the problems existing in eliminating the interference of zero-order diffraction and conjugate image in phase objects imaging technology by in-line digital holography, a new digital holography method with polarization detection is proposed. Two beams, a reference wave with a horizontal polarization state and an object wave with a vertical polarization state, are synthesized. Using polarization detection method to measure the Stokes parameters of synthesized beam, amplitude and phase difference information of these two beams is obtained. Then a virtual image which contains the information of object beam is constructed. The amplitude and phase information of the object is obtained without removing the zero-order and conjugate image components. In the experiments, a phase object with weak absorption is measured and clean reconstructed images are achieved, including the distributions of amplitude and phase. It is shown that the serious interference of the noise in conventional hologram, the zero-order diffraction and conjugate image can be overcome by applying this algorithm, and it is feasible and effective to extract amplitude and phase information of phase objects.
陈飞虎, 唐志列, 陈萍, 王娟, 付晓娣. Stokes参量数字全息法实现相位物体成像[J]. 光学学报, 2012, 32(7): 0709001. Chen Feihu, Tang Zhilie, Chen Ping, Wang Juan, Fu Xiaodi. Imaging Phase Objects by Digital Holography with Stokes Parameters[J]. Acta Optica Sinica, 2012, 32(7): 0709001.