Full-color holographic three-dimensional (3D) projection technology is an important research direction in the field of holographic 3D display, which is committed to providing the viewer with 3D impression and color experience. A simple encoding method of generating a phase-only hologram (POH) for low crosstalk full-color multi-plane holographic projection is proposed. Multiple two-dimensional (2D) slice images of a full-color 3D object can be reconstructed by a single composite hologram generated by the proposed encoding algorithm based on the analytical formula with no iteration. Numerical simulations and optical experiments show that colorful reconstructed images with low crosstalk are achieved successfully. The number of the projection planes can be dozens, as long as the size of hologram is increased and the intervals between different planes are designed reasonably. Meanwhile, the encoding method is realized with no iterative optimization required, which will speed up the calculation of the POH and the size of the system will be small and compact. It is expected to be used for realizing full-color 3D holographic display in future.

全彩全息三维（3D）投影技术是全息3D显示领域的一个重要研究方向，致力于为观看者提供3D印象和色彩体验。提出了一种为低串扰全色多平面全息投影生成仅相位全息图（POH）的简单编码方法。一个全彩色 3D 对象的多个二维 (2D) 切片图像可以由基于解析公式的所提出的编码算法生成的单个复合全息图重建，无需迭代。数值模拟和光学实验表明，成功实现了低串扰的彩色重建图像。投影平面的数量可以是几十个，只要增加全息图的尺寸，合理设计不同平面之间的间隔即可。同时，该编码方法无需迭代优化即可实现，加快了POH的计算，使系统体积小而紧凑。未来有望用于实现全彩3D全息显示。