光横向传播的光折变体全息透镜设计及其衍射性质

提出了一种新型的可用于光束横向传播的光折变体全息透镜。该透镜是由入射方向相互垂直的一束平面波和一束球面波在双掺杂的铌酸锂晶体平板上记录形成的，它可以将垂直入射晶体平板的输入光束产生横向传输并聚焦，或对输入光点产生横传并准直输出。该透镜除了具有一般体全息透镜的稳定性好、可靠性高的特点外，特别具有光束横向传播的功能，因而具有空占比小、更易于整个光学透镜系统的微小化集成的优点。利用局域体全息的耦合波理论，计算了该透镜衍射光的振幅分布和衍射效率。计算了该透镜的焦面上的强度分布，并与理想球面波照射矩形孔径时焦面上的强度分布进行了比较。

Design of a New Type Lateral-Spread Photorefractive Volume Holographic Lens and Its Diffraction Properties

A new device of lateral-spread photorefractive volume holographic lens is presented. It is recorded holographically by the interference of a plane wave and a spherical wave in a double doped LiNbO3 crystal. The lens can laterally spread and focus the plane wave which perpendicularly incident crystal planar, and vice versa. The lens has the advantages of light weight, high reliability that the general volume holographic lens possesses. Moreover, it has the particular properties of lateral-spread, small duty ratio and easy of minimized integration. On the basis of the coupled-wave theory of local volume holography, the amplitude distribution and the diffraction efficiency of the diffracted beams are calculated. The normalized intensity profile at the focal plane is given and compared with that of an ideal convergent spherical wave.