公开(公告)号：US5471326A

公开(公告)日：1995-11-28

申请号：US56218

申请日：1993-04-30

申请人： James T. Hall ,  Arthur B. O'Connor ,  Susan M. Raffensperger ,  Seymour Levine

发明人： James T. Hall ,  Arthur B. O'Connor ,  Susan M. Raffensperger ,  Seymour Levine

IPC分类号： B64D45/08 ,  G02B26/10 ,  G02B5/32 ,  G02B5/28 ,  G02B27/42

CPC分类号： G02B26/106 ,  G03H2270/22

摘要： A holographic optical element (HOE) includes a substrate structure having rotational symmetry with respect to a rotational axis for rotatively supporting at least two holograms. A first hologram on the substrate structure in the path of a normally incident beam diffracts the beam by a first acute angle and in a first radial direction from the rotational axis to a first redirected path. A second hologram on the substrate structure in the first redirected path diffracts the beam by a different second acute angle and in an opposite second radial direction from the rotational axis to a second redirected path. As a result, the two holograms may be used to achieve a second redirected path at an angle to the rotational axis that has a size which is the difference between the size of the first angle and the size of the second angle. The substrate structure may include first, second, and third disc-shaped substrates bonded together so that the third substrate is in between the first and second substrates, and a thin-film interference filter may be included on the third substrate to suppress zero-order leakage through the first hologram. The filter element may include one of a dielectric stack, a transmission hologram, or a reflectance hologram. The first hologram may be imprinted to achieve total internal reflection of zero-order leakage through the second hologram. An additional interference filter may be included on either the output face of the HOE or on a separate window element in order to reflects any zero-order leakage from the second hologram. The HOE may also have Schmidt-type aberration correction superimposed on at least one of the holograms to compensate for spherical aberrations from an all spherical Cassegrain type of telescope.

摘要翻译： 全息光学元件（HOE）包括具有相对于旋转轴线旋转对称的衬底结构，用于旋转地支撑至少两个全息图。 在正常入射光束的路径中的衬底结构上的第一全息图将光束从第一锐角和第一径向方向从旋转轴衍射到第一重定向路径。 在第一重定向路径中的衬底结构上的第二全息图将光束以不同的第二锐角和与旋转轴线相反的第二径向方向衍射到第二重定向路径。 结果，两个全息图可以用于实现与旋转轴成一定角度的第二重定向路径，其具有的尺寸是第一角度的大小与第二角度的尺寸之差。 衬底结构可以包括接合在一起的第一，第二和第三盘状衬底，使得第三衬底位于第一和第二衬底之间，并且可以在第三衬底上包括薄膜干涉滤光器以抑制零级 通过第一个全息图泄漏。 滤波器元件可以包括电介质叠层，透射全息图或反射全息图之一。 可以印刷第一全息图以实现通过第二全息图的零级泄漏的全内反射。 附加的干涉滤光片可以包括在HOE的输出面上或单独的窗口元件上，以便反射来自第二全息图的任何零级泄漏。 HOE还可以具有叠加在至少一个全息图上的施密特型像差校正，以补偿来自全球形卡塞格伦型望远镜的球面像差。