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    Polycrystalline ferroelectric optical devices
    3.
    发明授权
    Polycrystalline ferroelectric optical devices 失效
    多晶铁电光器件

    公开(公告)号：US06694082B2

    公开(公告)日：2004-02-17

    申请号：US09826528

    申请日：2001-04-05

    申请人： Harold Yoonsung Hwang ,  Markus J P Siegert

    发明人： Harold Yoonsung Hwang ,  Markus J P Siegert

    IPC分类号： G02B610

    CPC分类号： G02F1/035 ,  G02F1/0027 ,  G02F2202/20 ,  G02F2203/07

    摘要： An optical device comprises a body of ferroelectric material exhibiting an effective electro-optic coefficient (reff) and an optical loss (&agr;), with the body being adapted for the propagation of optical radiation at a wavelength &lgr;o through it, and means for applying an electric field to the body in order to alter the refractive index therein, characterized in that the body is polycrystalline and has an average grain size such that reff is relatively high and &agr; is relatively low, both at &lgr;o. In a preferred embodiment the body has an average grain size that is less than about &lgr;o/10, preferably in the range of approximately 8-20 nm, which is especially well suited for devices operating at near infrared wavelengths in the range of about 1000-1600 nm. Illustratively, the ferroelectric body is a perovskite material such as barium titanate or lithium niobate.

    摘要翻译： 光学装置包括具有有效电光系数（Reff）和光损耗（α）的铁电材料体，其中该主体适于通过其传播波长兰波的光辐射，以及用于施加 电场以改变其中的折射率，其特征在于，身体是多晶的，并且具有平均晶粒尺寸，使得reff相对较高，并且α相对较低，两者都在兰宝岛。 在优选的实施方案中，主体具有小于约lambdao / 10的平均粒度，优选在约8-20nm的范围内，其特别适用于在近红外波长范围内操作的装置， 1600nm。 说明性地，铁电体是钙钛矿材料，例如钛酸钡或铌酸锂。

    Article comprising a planar optical waveguide with optically non-linear core
    5.
    发明授权
    Article comprising a planar optical waveguide with optically non-linear core 失效
    该文章包括具有光学非线性芯的平面光波导

    公开(公告)号：US06208792B1

    公开(公告)日：2001-03-27

    申请号：US09399625

    申请日：1999-09-20

    申请人： Harold Yoonsung Hwang ,  Gadi Lenz ,  Malcolm Ellis Lines ,  Richart Elliott Slusher

    发明人： Harold Yoonsung Hwang ,  Gadi Lenz ,  Malcolm Ellis Lines ,  Richart Elliott Slusher

    IPC分类号： G02B610

    CPC分类号： G02F1/365 ,  G02B2006/12035 ,  G02F1/3555

    摘要： Waveguides according to this invention have a chalcogenide glass core that comprises Se and one or both of As and Ge, and further comprises one or more dopant elements selected from the elements that cause a change in optical energy gap Eg of the glass core. The amount of dopant is selected such that Eg is equal to or less than a 2-photon energy 2h&ngr;, where h is Planck's constant and &ngr;=c/&lgr;, where c is the speed of light in vacuum and &lgr; is an operating wavelength. The dopant elements furthermore are selected such that the chalcogenide glass core has a nonlinear refractive index n2 greater than 200n2 (SiO2), where n2 (SiO2) is the nonlinear index of silica at &lgr;. Typically, &lgr; is about 1.55 &mgr;m. Exemplary, the dopant elements are selected from Sb, Bi, Sn, Pb, In, Tl, Cu, Ag and S. Currently preferred dopants are Te, Sb, Tl, Cu and Ag. Waveguides according to the invention are advantageously used in all-optical switches, optical logic elements and other means for optical processing of optical pulses.

    摘要翻译： 根据本发明的波导具有硫族化物玻璃芯，其包含Se和As和Ge中的一种或两种，并且还包括从引起玻璃芯的光能间隙Eg的变化的元素中选择的一种或多种掺杂剂元素。 选择掺杂剂的量使得Eg等于或小于2-光子能量2h＆ngr，其中h是普朗克常数，并且＆ngr; = c / lambd，其中c是真空中的光速，并且羔羊是操作的 波长。 此外，掺杂剂元素被选择为使得硫族化物玻璃核具有大于200n2（SiO 2）的非线性折射率n2，其中n2（SiO2）是羔羊二氧化硅的非线性指数。 通常，羔羊约1.55 mum。 示例性地，掺杂剂元素选自Sb，Bi，Sn，Pb，In，Tl，Cu，Ag和S.目前优选的掺杂剂是Te，Sb，Tl，Cu和Ag。 根据本发明的波导有利地用于全光开关，光逻辑元件和用于光脉冲光学处理的其它装置。