Opt Lett. 2021 Nov 1;46(21):5445-5448. doi: 10.1364/OL.431769.
Color rainbow holography can realize color holographic 3D display without speckle noise under white light illumination. However, traditional color rainbow holograms used for high-resolution static color 3D display or near-eye color display are amplitude-type, resulting in low diffraction efficiency due to the presence of conjugate light. In this Letter, a phase-only color rainbow holographic near-eye display is demonstrated. The calculation of a phase-only color rainbow hologram is realized by combining a band-limited diffraction and a bi-directional error diffusion algorithm with high-frequency blazed gratings coded to control longitudinal dispersion. When the wavelength of illumination light is deviated from the designated wavelength of the hologram, only a certain wavefront aberration is caused, but there is no conjugate light. The phase-only color rainbow holographic near-eye display of both a 2D color image and a 3D scene are implemented by optical experiments. It has potential applications in head-mounted 3D augmented reality displays without vergence-accommodation conflict.
彩色彩虹全息术可以在白光照明下实现无散斑噪声的彩色全息 3D 显示。然而，传统用于高分辨率静态彩色 3D 显示或近眼彩色显示的彩色彩虹全息图是振幅型的，由于存在共轭光，导致衍射效率较低。在本信中，演示了一种纯位相彩色彩虹全息近眼显示。通过结合带限衍射和双向误差扩散算法以及编码有高频闪耀光栅来控制纵向色散，实现了纯位相彩色彩虹全息图的计算。当照明光的波长偏离全息图的指定波长时，只会引起一定的波前像差，但没有共轭光。通过光学实验实现了二维彩色图像和三维场景的纯位相彩色彩虹全息近眼显示。它在没有融合调节冲突的头戴式 3D 增强现实显示器中具有潜在的应用。
