为了减小体全息光栅用于全息波导显示时不同视场角下衍射光谱的偏移,提出选择最佳的光栅矢量倾斜角和像源光轴相对于体全息光栅的倾斜角,可以减小衍射光谱的偏移。为了使全息波导显示系统在给定入射角度范围内具有相同的衍射光谱范围,采用三次曝光记录了一层体全息光栅。仿真结果表明,当像源的光谱范围在524～540 nm之间时,该体全息光栅在入射角度范围－3°～3°内的衍射光谱范围相同,提高了给定入射角度范围内衍射光谱范围的一致性,可以应用于全息波导显示系统中。

In order to reduce the diffracted spectrum shift of the holographic wave-guided display systems within the entire field of view,the optimum slant angle of grating vector and the optimum slant angle of the image source optical axis relative to the volume grating were used.To get the same diffraction spectrum range in the given incident angular range,one-layer volume holographic grating was recorded based on three-step exposure.The numerical simulation shows that：The wavelength ranges of diffracted light are kept the same with the incident angular at －3° to 3° when the spectrum of light source is in the range of 524 nm to 540 nm.The uniformity of the diffraction spectrum range is improved,and this design can be used in holographic waveguide display systems.