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    Broadband optical retardation device
    2.
    发明授权
    Broadband optical retardation device 失效
    宽带光学延迟器

    公开(公告)号：US06735017B1

    公开(公告)日：2004-05-11

    申请号：US09555187

    申请日：2000-05-25

    申请人： Elizabeth Jane Acosta ,  Emma Jayne Beynon ,  Adrian Marc Simon Jacobs ,  Michael Geraint Robinson ,  Kirstin Ann Saynor ,  Martin David Tillin ,  Michael John Towler ,  Harry Garth Walton

    发明人： Elizabeth Jane Acosta ,  Emma Jayne Beynon ,  Adrian Marc Simon Jacobs ,  Michael Geraint Robinson ,  Kirstin Ann Saynor ,  Martin David Tillin ,  Michael John Towler ,  Harry Garth Walton

    IPC分类号： G02B2728

    CPC分类号： G02B5/3083 ,  G02F1/13363 ,  G02F1/133753 ,  G02F1/133788 ,  G02F2001/133638 ,  G02F2413/02 ,  G02F2413/08 ,  G02F2413/09 ,  G02F2413/15 ,  H04N13/337

    摘要： A broadband optical retardation device, such as may be used for polarisation encoding of display information or in diffractive optical systems, includes a patterned uniform half wave plate retarder in combination with a non-patterned uniform quarter wave plate retarder having an optic axis oriented at 90° to the xz plane. The patterned retarder consists of alternating first and second regions having first and second optic axes at different orientations to a reference axis, for example at +22.5° and −22.5° to the xz plane. Considering light of wavelength &lgr;° incident on the retarder and linearly polarised in the xy plane, such light is differently polarised by the regions, and the light output by the device includes regions in which the light is right circularly polarised and regions in which the light is left circularly polarised. In the case of incident light of wavelengths greater or less than &lgr;°, the output light becomes progressively more linearly polarised as the wavelengths departs to a greater extent from the ideal value, but not to the same extent as would be the case if the device consisted simply of a patterned single layer acting as a quarter plate retarder.

    摘要翻译： 诸如可用于显示信息的偏振编码或衍射光学系统中的宽带光学延迟装置包括图案化的均匀半波板延迟器，其与未图案化的均匀四分之一波片延迟器组合，其光轴定向为90° °到xz平面。 图案化延迟器由交替的第一和第二区域组成，第一和第二区域具有与参考轴不同取向的第一和第二光轴，例如与xz平面成+ 22.5°和-22.5°。 考虑入射到延迟器上并在xy平面上线性偏振的波长λ°的光，这种光被区域不同地偏振，并且由器件输出的光包括其中光是正向圆偏振的区域，其中光 被左旋极化。 在波长大于或小于λ°的入射光的情况下，随着波长从理想值更大程度地偏离，输出光逐渐变得更线性偏振，但不如与设备 简单地由作为四分之一板延迟器的图案化单层组成。