Lu Xingyuan, Wang Zhuoyi, Zhao Chengliang, Zhan Qiwen, Cai Yangjian
School of Physical Science and Technology, Soochow University, Suzhou 215006, China.
School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.
Nanophotonics. 2023 Jul 26;12(17):3463-3470. doi: 10.1515/nanoph-2023-0288. eCollection 2023 Aug.
The intensity distributions and statistics of partially coherent light fields with random fluctuations have proven to be more robust than for coherent light. However, its full potential in practical applications has not been realized due to the lack of four-dimensional optical field measurement. Here, a general incoherent modal decomposition method of partially coherent light field is proposed and demonstrated experimentally. The decomposed random modes can be used to, but not limited to, reconstruct average intensity, cross-spectral density, and orthogonal decomposition properties of the partially coherent light fields. The versatility and flexibility of this method allows it to reveal the invariance of light fields and to retrieve embedded information after propagation through complex media. The Gaussian-shell-model beam and partially coherent Gaussian array are used as examples to demonstrate the reconstruction and even prediction of second-order statistics. This method is expected to pave the way for applications of partially coherent light in optical imaging, optical encryption, and antiturbulence optical communication.
具有随机涨落的部分相干光场的强度分布和统计特性已被证明比相干光更具稳健性。然而，由于缺乏四维光场测量，其在实际应用中的全部潜力尚未实现。在此，提出了一种部分相干光场的通用非相干模态分解方法，并进行了实验验证。分解后的随机模式可用于（但不限于）重建部分相干光场的平均强度、交叉谱密度和正交分解特性。该方法的通用性和灵活性使其能够揭示光场的不变性，并在通过复杂介质传播后检索嵌入的信息。以高斯壳模型光束和部分相干高斯阵列为例，演示了二阶统计量的重建甚至预测。该方法有望为部分相干光在光学成像、光学加密和抗湍流光通信中的应用铺平道路。
