为了提高全息光学系统的光学效率，提出用分光棱镜和光栅对图像进行出瞳扩展，并通过双光栅设计改善光学系统的成像质量。通过光学系统建模，分析了光学系统成像质量并进行仿真。光学系统的视场为20°×20°，出瞳大小为20 mm×20 mm，剩余波像差为0.075λ，畸变小于0.01%，调制传递函数(MTF)接近衍射限。对于零视场光学系统的出瞳具有完全均匀辐照度分布，光能利用率约5%~6%。而对于20°视场系统出瞳辐照度均匀性略有下降，光能利用率为3%~4%。结果表明，该全息波导系统显著提高了全息波导头盔显示系统的光能利用率。并且棱镜波导系统具有高度可行性，可以应用于新一代头盔显示技术。

In order to enhance the optical efficiency, splitting prisms and holographic gratings are used to expand the exit pupil. And double-grating design is used to enhance the image quality. By modeling the system with optical design software, the optical quality is analyzed and simulated. The system has a field of view (FOV) of 20°×20°and an exit pupil of 20 mm×20 mm. The residual wave aberration is less than 0.075λ, the distortion is less than 0.01%, and the modulation transfer function close to the diffraction limit. For the zero FOV, the exit pupil has uniform irradiance distribution with an optical efficiency of 5%~6%. For the FOV of 20°, the irradiance uniformity drops down slightly, and the optical efficiency is 3%~4%. The simulated results show that the holographic waveguide system dramatically improves the optical efficiency of the holographic waveguide head-mounted display (HMD) system. Also the prisms waveguide optical system is highly practical and can be applied to the new generation HMD technology.