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    Bragg grating and method of producing a Bragg grating using an ultrafast laser
    3.
    发明授权
    Bragg grating and method of producing a Bragg grating using an ultrafast laser 有权
    布拉格光栅和使用超快激光产生布拉格光栅的方法

    公开(公告)号：US07031571B2

    公开(公告)日：2006-04-18

    申请号：US10803890

    申请日：2004-03-19

    申请人： Stephen J. Mihailov ,  Dan Grobnic ,  Christopher Smelser ,  Robert Walker ,  Ping Lu ,  Huimin Ding ,  George Henderson ,  Xiaoli Dai

    发明人： Stephen J. Mihailov ,  Dan Grobnic ,  Christopher Smelser ,  Robert Walker ,  Ping Lu ,  Huimin Ding ,  George Henderson ,  Xiaoli Dai

    IPC分类号： G02B6/34

    CPC分类号： G02B6/02138 ,  G02B5/1857 ,  G02B6/021 ,  G02B6/124

    摘要： A novel Bragg grating filter in optical waveguiding fiber with suppressed cladding mode coupling and method of producing same is disclosed. The novel grating structure is induced in both the core and the cladding of the optical fiber irrespective of the photosensitivity of the core or cladding to actinic radiation. Such core and cladding of the optical fiber need not be chemically doped to support the grating. The method incorporates an ultra short duration pulse laser source. Electromagnetic radiation provided from the laser propagates to a diffractive element positioned a specific distance to the target material such that the diffracted electromagnetic radiation forms a 2-beam interference pattern, the peaks of which are sufficiently intense to cause a change in index of refraction.

    摘要翻译： 公开了一种具有抑制包层模耦合的光波导纤维中的新型布拉格光栅滤波器及其制造方法。 不管芯或包层对光化辐射的光敏性如何，在光纤的芯和包层中都引入新颖的光栅结构。 光纤的这种芯和包层不需要化学掺杂以支持光栅。 该方法结合了超短脉冲激光源。 从激光器提供的电磁辐射传播到与目标材料相距特定距离的衍射元件，使得衍射的电磁辐射形成2光束干涉图案，其峰值足够强以引起折射率的变化。

    HIGH TEMPERATURE STABLE FIBER GRATING SENSOR AND METHOD FOR PRODUCING SAME
    7.
    发明申请
    HIGH TEMPERATURE STABLE FIBER GRATING SENSOR AND METHOD FOR PRODUCING SAME 有权
    高温稳定光纤光栅传感器及其制造方法

    公开(公告)号：US20120324959A1

    公开(公告)日：2012-12-27

    申请号：US13592845

    申请日：2012-08-23

    申请人： Christopher W. Smelser ,  Stephen J. Mihailov ,  Dan Grobnic ,  Ping Lu ,  Robert B. Walker ,  Gino Cuglietta ,  Huimin Ding ,  Xiaoli Dai

    发明人： Christopher W. Smelser ,  Stephen J. Mihailov ,  Dan Grobnic ,  Ping Lu ,  Robert B. Walker ,  Gino Cuglietta ,  Huimin Ding ,  Xiaoli Dai

    IPC分类号： C03B37/01 ,  G02B6/00

    CPC分类号： G02B6/13 ,  G02B6/02114 ,  G02B6/02138

    摘要： A method of producing a thermally stable grating allows the grating to be placed in environments where temperatures reach 1000° C. These gratings may be concatenated so as to form a sensor array. The method requires a step of lowering the characteristic intensity threshold of a waveguide by at least 25%, followed by irradiating the waveguide with femtosecond pulses of light having a sufficient intensity and for a sufficient duration to write the grating so that at least 60% of the grating remains after exposures of at least 10 hours at a temperature of at least 1000° C. Pre-writing a Type I grating before writing a minimal damage Type II grating lowers the characteristic threshold of the waveguide so that a stable low damage type II grating can be written; alternatively providing a hydrogen or deuterium loaded waveguide before writing the grating lowers the characteristic threshold of the waveguide.

    摘要翻译： 制造热稳定光栅的方法允许将光栅置于温度达到1000℃的环境中。这些光栅可以被级联以便形成传感器阵列。 该方法需要将波导的特征强度阈值降低至少25％的步骤，随后用具有足够强度的飞秒脉冲照射波导并持续足够的持续时间来写入光栅，使得至少60％的 在至少1000℃的温度下，光栅保持至少10小时的曝光。在写入最小损伤II型光栅之前预写I型光栅降低了波导的特征阈值，使得稳定的低损伤II型 光栅可写; 或者在写入光栅之前提供加氢或氘负载的波导降低波导的特征阈值。