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提出了一种扩大全息激光防护镜防护角的方法：将两块条纹面与介质表面相倾斜的反射全息对称胶合，致使防护角与单片反射全息相比提高了一倍。实验结果表明０．５３μｍ的光在－３０°至２７°范围内入射时；双斜复合反射全息的光学密度在２．３至３．５之间变化，可见光透过率大于６０％。
A method for enlarging the guard angle of a holographic laser protective lens is proposed. Symmetrical gluing of the two striped surfaces tilted with respect to the surface of the medium is symmetrically glued, resulting in a doubling of the guard angle from that of the monolithic reflective hologram. Experimental results show that when the light of 0.53μm is incident within the range of -30 ° to 27 °, the optical density of the double-oblique composite reflective hologram varies from 2.3 to 3.5 and the visible light transmittance is over 60%.