Speckle-free compact holographic near-eye display using camera-in-the-loop optimization with phase constraint

We present a compact holographic near-eye display system with high-quality speckle -free optical reconstructions using camera-in-the-loop (CITL) optimization with phase constraint strategy. The CITL optimization with phase constraint is used to iteratively synthesize the computer-generated holograms (CGHs) based on the in-system optical feedback. The phase constraint embedded into the whole CGH optimization process can effectively smooth the phase profile of reconstructed wave field, which helps to suppress the speckle noise caused by the phase singularities in CGH reconstruction. Numerical and optical experiments have been performed to demonstrate that the proposed method can provide speckle-free optical reconstructions with excellent image fidelity for holographic near-eye display in a compact setup.

我们提出了一种紧凑的近眼全息显示系统，该系统通过采用具有相位约束策略的在环相机（CITL）优化，实现了高质量的无散斑光学重建。具有相位约束的CITL优化用于基于系统内的光学反馈迭代合成计算机生成的全息图（CGH）。嵌入整个CGH优化过程的相位约束能够有效地平滑重建波场的相位分布，这有助于抑制CGH重建中由相位奇点引起的散斑噪声。我们进行了数值和光学实验，结果表明所提出的方法能够在紧凑的装置中为近眼全息显示提供具有出色图像保真度的无散斑光学重建。