基于相关全息原理的散射成像技术及其进展

由于随机散射效应,相干光束经过强散射介质后,出射光场变成光强呈无序分布的散斑场,因此无法直接从出射场获取入射光的信息。然而,在随机散射过程中,出射散斑场仍然携带着入射光场信息。从散斑场中获取原始信息以实现物体的重建是一个备受关注的研究课题。研究人员针对该问题提出了包括散斑相关、传输矩阵、波前调控及时间反演与相位共轭等技术。着重介绍了基于相关全息原理的散射成像技术,主要包括其原理、发展历史以及最新的研究进展,并对该技术的未来发展趋势进行了展望。

Progress on Scattering Imaging Technologies Based on Correlation Holography

When a coherent beam propagates through a strong scattering medium,a speckle pattern of the output field can be formed due to random scattering.As a consequence,it is impossible to directly acquire the original information of the input beam from the output scattering field.However,in the random scattering process,the output speckle pattern still contains the original information of the incident beam.The acquirement of the original information based on speckle patterns for the reconstruction of an object has become a hot research topic.As for this problem,the techniques including speckle correlation,transmission matrix,wavefront control as well as time reversal and phase conjugation have been proposed.The scattering imaging technique based on correlation holographic theory is mainly introduced,in which its principle,history and recent new progress are included.In addition,its future development is prospected.