Opt Lett. 2022 Jun 1;47(11):2738-2741. doi: 10.1364/OL.461029.
Digital optical phase conjugation (DOPC) can be applied for light-field focusing and imaging through or within scattering media. Traditional DOPC only recovers the phase but loses the polarization information of the original incident beam. In this Letter, we propose a dual-polarization-encoded DOPC to recover the full information (both phase and polarization) of the incident beam. The phase distributions of two orthogonal polarization components of the speckle field coming from a multimode fiber are first measured by using digital holography. Then, the phase distributions are separately modulated on two beams and their conjugations are superposed to recover the incident beam through the fiber. By changing the phase difference or amplitude ratio between the two conjugate beams, light fields with complex polarization distribution can also be generated. This method will broaden the application scope of DOPC in imaging through scattering media.
数字光相位共轭（DOPC）可用于通过或在散射介质中对光场进行聚焦和成像。传统的 DOPC 仅恢复相位，但会丢失原始入射光束的偏振信息。在本信中，我们提出了一种双偏振编码的 DOPC 来恢复入射光束的全部信息（相位和偏振）。首先，通过数字全息术测量来自多模光纤的散斑场的两个正交偏振分量的相位分布。然后，分别对两个光束进行相位调制，并将它们的共轭叠加以通过光纤恢复入射光束。通过改变两个共轭光束之间的相位差或振幅比，也可以产生具有复杂偏振分布的光场。该方法将拓宽 DOPC 在散射介质中成像的应用范围。
