透射式K空间变换数字全息三维成像技术研究  

Transmission Mode K-domain Transform Based Digital Holographic Three-Dimensional Imaging Technology

作　　者：张熙 王绶玙[1] 孔艳[1] 何小亮[1] 蒋志龙 刘诚[1,2] Zhang Xi;Wang Shouyu;Kong Yan;He Xiaoliang;Jiang Zhilong;Liu Cheng(School of Science,Jiangnan University,Wuxi,Jiangsu 214122,China;Shayighai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]江南大学理学院,江苏无锡214122 [2]中国科学院上海光学精密机械研究所,上海201800

出　　处：《中国激光》2021年第21期137-144,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(12004141,U1730132);中央高校基本科研业务费专项资金资助(JUSRP51721B);江苏省自然科学基金(BK20200588,BK20180598)。

摘　　要：为了克服传统数字全息三维成像技术的扫描速度慢等诸多缺点,设计一种仅需单波长且可以一维扫描的透射式K空间变换数字全息三维成像技术。首先采用片状光束对样品进行照明并记录透射光的离轴全息图;然后利用传统的数字全息重建技术得到透射光的复振幅分布后去除其低频分量;最后在频谱空间进行坐标变换并对变换后的空间频谱进行傅里叶逆变换,便可得到被照明切片平面上的样品结构信息。在对工作原理和主要参数进行系统理论分析的基础上,利用数值模拟和光学实验对此技术的可行性进行实际验证。由于该技术能够使用透射光进行三维层析成像,因此很容易推广并应用于X光和其他短波长的辐射源成像,为研究样品高分辨三维结构提供新的工具。Objective Compared to traditional holography that relies on silver salt films,digital holography can reconstruct sample wavefront from holograms recorded by digital cameras via Fresnel transform as modern image processing.Therefore,digital holography is more convenient,fast and been widely studied and used in biological tissue imaging,particle tracking,encryption and measurements.Although refocusing is required,samples in digital holography can be focused at any depth for observation,whereas ordinary digital holography cannot provide sample tomographic structure.Optical diffraction tomography via angular scanning has been proposed as a method for obtaining tomographic imaging by combining computed tomography and holography;however,the optical system is complex and the spatial resolution is considerably limited by the accuracy and the range of the scanning mechanism.Multi-wavelength digital holography similar to optical coherence tomography has also been designed for tomographic imaging and it completely avoids the mechanical scanning in the imaging process.The samples,however,have different refractive indices for different wavelengths due to the dispersion effect.To address the shortcomings of traditional digital holographic tomography,this paper proposes a transmission mode K-domain transform-based digital holographic three-dimensional imaging method that requires only a single wavelength and one-dimensional sample scanning and is completely different from existing methods.Methods In transmission mode K-domain transform-based digital holographic three-dimensional imaging method,light sheet formed by a cylindrical lens is used to illuminate the sample and the off-axis hologram of the transmitted light is recorded via the interference between another reference light sheet.After the complex amplitude of the transmitted light is obtained using the traditional digital holographic reconstruction method,its spectrum is calculated and its low-frequency component is removed via high-pass filtering.Thus,the component of z

关 键 词：全息 数字全息 三维显微成像 K空间变换 透射成像 

分 类 号：O438[机械工程—光学工程]