Duan Xinhui, Liu Juan, Li Xin, Xue Gaolei, Zhao Tao, Duan Junyi
Opt Express. 2019 Mar 4;27(5):6851-6862. doi: 10.1364/OE.27.006851.
Partially temporal coherent light (PTCL) has been applied to holographic reconstruction to reduce speckle noise in display systems, while the encoding methods of computer-generated hologram (CGH), based on PTCL, have not been reported. We propose a novel method to encoding CGH, in which a PTCL with a broadband continuous spectrum is used to illuminate the object image. The continuous spectrum is discretized into different wavelengths and a weight value associated with PTCL power spectrum is assigned to each wavelength. The diffractive transmission is based on Fresnel diffraction theory. The phase distribution of the encoded CGH is obtained using the sum of multiplying the different CGH phase distributions of corresponding discrete wavelengths by the corresponding weight values. The modulation results without iteration are performed to verify the feasibility of the proposed method and the iterative algorithm is introduced to improve the quality of the modulation. The reconstructed images from the proposed encoding method exhibit high quality as compared with that obtained from the encoding method based on ideal temporal coherent light. Numerical simulations and optical experiments are good consistent with each other. The proposed method can provide a reference for various wave-front modulations.
部分时间相干光（PTCL）已被应用于全息重建，以减少显示系统中的散斑噪声，然而基于PTCL的计算全息图（CGH）的编码方法尚未见报道。我们提出了一种编码CGH的新方法，其中使用具有宽带连续光谱的PTCL来照亮物体图像。连续光谱被离散化为不同波长，并为每个波长分配一个与PTCL功率谱相关的权重值。衍射透射基于菲涅耳衍射理论。通过将相应离散波长的不同CGH相位分布乘以相应权重值之和来获得编码CGH的相位分布。进行无迭代的调制结果以验证所提方法的可行性，并引入迭代算法以提高调制质量。与基于理想时间相干光的编码方法相比，所提编码方法重建的图像具有高质量。数值模拟和光学实验相互吻合良好。所提方法可为各种波前调制提供参考。
