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    • 53. 发明授权
    • Large diameter optical waveguide, grating and laser
    • 大直径光波导,光栅和激光
    • US07437043B2
    • 2008-10-14
    • US11324759
    • 2006-01-03
    • Martin A. PutnamRobert N. BrucatoPaul E. SandersTimothy J. BaileyJames M. SullivanAlan D. Kersey
    • Martin A. PutnamRobert N. BrucatoPaul E. SandersTimothy J. BaileyJames M. SullivanAlan D. Kersey
    • G02B6/02
    • G02B6/022G02B6/02G02B6/02042H01S3/06708H01S3/06729H01S3/06754
    • A large diameter optical waveguide, grating, and laser includes a waveguide 10 having at least one core 12 surrounded by a cladding 14, the core propagating light in substantially a few transverse spatial modes; and having an outer waveguide dimension d2 of said waveguide being greater than about 0.3 mm. At least one Bragg grating 16 may be impressed in the waveguide 10. The waveguide 10 may be axially compressed which causes the length L of the waveguide 10 to decrease without buckling. The waveguide 10 may be used for any application where a waveguide needs to be compression tuned, e.g., compression-tuned fiber gratings and lasers or other applications. Also, the waveguide 10 exhibits lower mode coupling from the core 12 to the cladding 14 and allows for higher optical power to be used when writing gratings 16 without damaging the waveguide 10. The shape of the waveguide 10 may have other geometries (e.g., a “dogbone” shape) and/or more than one grating or pair of gratings may be used and more than one core may be used. The core and/or cladding 12,14 may be doped with a rare-earth dopant and/or may be photosensitive. At least a portion of the core 12 may be doped between a pair of gratings 50,52 to form a fiber laser or the grating 16 or may be constructed as a tunable DFB fiber laser or an interactive fiber laser within the waveguide 10. The waveguide may resemble a short “block” or a longer “cane” type, depending on the application and dimensions used.
    • 大直径光波导,光栅和激光器包括具有由包层14围绕的至少一个芯12的波导10,芯以基本上几个横向空间模式传播光; 并且所述波导的外波导尺寸d 2大于约0.3mm。 可以在波导10中施加至少一个布拉格光栅16.波导10可以被轴向压缩,这导致波导10的长度L在没有弯曲的情况下减小。 波导管10可用于波导需要被压缩调谐的任何应用,例如压缩调谐的光纤光栅和激光器或其它应用。 此外,波导10表现出从芯12到包层14的较低模式耦合,并且允许在写入光栅16时使用更高的光功率,而不损坏波导10.波导10的形状可具有其他几何形状(例如, “狗骨”形状)和/或可以使用多于一个的光栅或一对光栅,并且可以使用多于一个的核心。 芯和/或包层12,14可掺杂稀土掺杂剂和/或可以是光敏的。 芯12的至少一部分可以掺杂在一对光栅50,52之间以形成光纤激光器或光栅16,或者可以被构造为波导10内的可调DFB光纤激光器或交互光纤激光器。波导 可能类似于短的“块”或更长的“手杖”类型,具体取决于所使用的应用和尺寸。
    • 56. 发明授权
    • Temperature compensated optical device
    • 温度补偿光学器件
    • US06621957B1
    • 2003-09-16
    • US09699940
    • 2000-10-30
    • James M. SullivanTimothy J. BaileyRobert N. BrucatoThomas W. EngelMark R. FernaldRichard T. JonesAlan D. KerseyTrevor MacDougallMatthew B. MillerMartin A. PutnamPaul E. SandersJames S. Sirkis
    • James M. SullivanTimothy J. BaileyRobert N. BrucatoThomas W. EngelMark R. FernaldRichard T. JonesAlan D. KerseyTrevor MacDougallMatthew B. MillerMartin A. PutnamPaul E. SandersJames S. Sirkis
    • G02B634
    • G02F1/0115G02B6/0218H01S3/0675H01S3/1028
    • A temperature compensated optical device includes a compression-tuned glass element 10 having a Bragg grating 12 therein, a compensating material spacer 26 and an end cap 28 all held within an outer shell 30. The element 10, end cap 28 and shell 30 are made of a material having a low coefficient of thermal expansion (CTE), e.g., silica, quartz, etc. and the spacer 26 is made of a material having a higher CTE, e.g., metal, Pyrex®, ceramic, etc. The material and length L5 of the spacer 26 is selected to offset the upward grating wavelength shift due to temperature. As temperature rises, the spacer 26 expands faster than the silica structure causing a compressive strain to be exerted on the element 10, which shifts the wavelength of the grating 12 down to balance the intrinsic temperature induces wavelength shift up. As a result, the grating 12 wavelength is substantially unchanged over a wide temperature range. The element 10 includes either an optical fiber having at least one Bragg grating 12 impressed therein encased within and fused to at least a portion of a glass capillary tube or a large diameter waveguide (or cane) with a grating 12 having a core 11 and a wide cladding, which does not buckle over a large range of compressive axial strains. The element may have a “dogbone” shape to amplify compressive strain on the grating 12. The device 8 may also be placed in an axially tunable system that allows the wavelength to be dynamically tuned while remaining athermal. In addition to a grating, the device may be an athermal laser, DFB laser, etc. Also, the entire device 8 may be all made of monolithic glass materials.
    • 温度补偿光学器件包括其中具有布拉格光栅12的压缩调谐玻璃元件10,补偿材料间隔件26和端盖28,所述补偿材料间隔件26和端盖28都保持在外壳30内。元件10,端帽28和壳体30被制成 具有低热膨胀系数(CTE)的材料,例如二氧化硅,石英等,并且间隔物26由具有较高CTE(例如金属,Pyrex,陶瓷等)的材料制成。 选择间隔件26的材料和长度L5以抵消由于温度引起的向上光栅波长偏移。 随着温度升高,间隔件26比二氧化硅结构膨胀得更快,导致施加在元件10上的压缩应变,其将光栅12的波长向下移动以平衡本征温度,从而引起波长向上移动。 结果,光栅12的波长在宽温度范围内基本上不变。 元件10包括具有至少一个布拉格光栅12的光纤,该光纤封装在玻璃毛细管或大直径波导(或甘蔗)的至少一部分内并与其融合,其中光栅12具有芯11和 宽的包层,其在大范围的压缩轴向应变下不扣合。 元件可以具有“狗骨”形状以放大光栅12上的压缩应变。器件8也可以放置在轴向可调谐系统中,其允许波长被动态调谐而保持不耐热。 除了光栅之外,该器件可以是无热激光器,DFB激光器等。此外,整个器件8可以全部由单片玻璃材料制成。
    • 58. 发明授权
    • Tube-encased fiber grating
    • 管状光纤光栅
    • US06519388B1
    • 2003-02-11
    • US09455865
    • 1999-12-06
    • Mark R. FernaldTimothy J. BaileyMatthew B. MillerJames M. SullivanMichael A. DavisPeter OgleAlan D. KerseyMartin A. PutnamRobert N. BrucatoPaul E. Sanders
    • Mark R. FernaldTimothy J. BaileyMatthew B. MillerJames M. SullivanMichael A. DavisPeter OgleAlan D. KerseyMartin A. PutnamRobert N. BrucatoPaul E. Sanders
    • G02B634
    • G02B6/022G02B6/0218
    • A tube-encased fiber grating includes an optical fiber 10 having at least one Bragg grating 12 impressed therein which is embedded within a glass capillary tube 20. Light 14 is incident on the grating 12 and light 16 is reflected at a reflection wavelength &lgr;1. The shape of the tube 20 may be other geometries (e.g., a “dogbone” shape) and/or more than one concentric tube may be used or more than one grating or pair of gratings may be used. The fiber 10 may be doped at least between a pair of gratings 150,152, encased in the tube 20 to form a tube-encased compression-tuned fiber laser or the grating 12 or gratings 150,152 may be constructed as a tunable DFB fiber laser encased in the tube 20. Also, the tube 20 may have an inner region 22 which is tapered away from the fiber 10 to provide strain relief for the fiber 10, or the tube 20 may have tapered (or fluted) sections 27 which have an outer geometry that decreases down to the fiber 10 and provides added fiber pull strength. Also, the tube-encased grating 12 exhibits lower mode coupling from the fiber core to the cladding modes due to the increased diameter of the cladding where the tube 20 is fused to the fiber 10 where the grating is located 12.
    • 管状光纤光栅包括光纤10,其具有嵌入其中的至少一个布拉格光栅12,该布拉格光栅12嵌入玻璃毛细管20内。光14入射到光栅12上,光16以反射波长lambd1反射。 管20的形状可以是其他几何形状(例如,“狗骨”形状)和/或可以使用多于一个的同心管,或者可以使用多于一个的光栅或一对光栅。 纤维10可以至少掺杂在一对光栅150,152之间,封装在管20中以形成管封装的压缩调谐光纤激光器,或者光栅12或光栅150,152可被构造为包含在该光纤12中的可调DFB光纤激光器。 管20也可以具有内部区域22,该内部区域22远离纤维10逐渐变细,以为纤维10提供应变消除,或者管20可以具有锥形(或凹槽)部分27,其具有外部几何形状 降低到纤维10并提供增加的纤维拉伸强度。 此外,由于包层的直径增加,管20被熔合到光栅位于12处的光纤10,管状光栅12表现出从纤维芯到包层模式的较低模式耦合。
    • 59. 发明授权
    • Method and apparatus for forming a Bragg grating with high intensity light
    • 用于形成具有高强度光的布拉格光栅的方法和装置
    • US06249624B1
    • 2001-06-19
    • US09206171
    • 1998-12-04
    • Martin A. PutnamRobert N. Brucato
    • Martin A. PutnamRobert N. Brucato
    • G02B634
    • G02B6/02133G02B2006/02161
    • A method and apparatus for forming a Bragg grating using a high intensity light includes a pair of focussed writing beams 26,34 that simultaneously intersect and interfere with each other at a region 30 of a photosensitive optical fiber 28. The beams 26,34 have a high intensity (e.g., at least about 500 mjoules/cm2) and pass through an interface medium 50 that is substantially transparent to the wavelength of the writing beams 26,34. The medium has a thickness T set such that the intensity of the beams at the surface 56 of the medium 50 is below an surface damage intensity such that no ablations occur on the fiber 28 or the surface 56 when the fiber 28 is exposed to the beams 26,34.
    • 使用高强度光形成布拉格光栅的方法和装置包括一对聚焦的写入光束26,34,它们在光敏光纤28的区域30处同时相交并彼此干涉。光束26,34具有 高强度(例如,至少约500m焦耳/ cm2),并穿过基本上对书写光束26,34的波长透明的界面介质50。 介质具有厚度T设置,使得介质50的表面56处的光束的强度低于表面损伤强度,使得当光纤28暴露于光束时,纤维28或表面56上不会发生消融 26,34。