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公开(公告)号：JPH1152299A
公开(公告)日：1999-02-26
申请号：JP14754598
申请日：1998-05-28
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT A
Abstract: PROBLEM TO BE SOLVED: To make it possible to obtain a reflectivity side lobe sufficiently suppressed with respect to a reflectivity band and to manufacture good gratings by consisting of a light diverting part of a reflection surface and a non-reflection surface and non-absorptively diverging and parting the higher dimension space frequency component in the outer peripheral part of a laser beam from the central axis of the laser beam by the reflection surface. SOLUTION: The space filter 20 comprises the light diverting member 22 of the single substance which is formed of a transparent non-absorptive optical material and consists of a preferably circular aperture. The aperture has the non-reflection surface 26 and the reflection surface 28. The central axis 31 and central part 38 of the incident laser beam 24 pass the aperture in the central part of the aperture. The outer peripheral part 40 is made incident on the light diverting member 22, passes the non-reflection surface 26 toward the reflection surface 28 where the unnecessary higher dimension space frequency component of the outer peripheral part 40 is diverged from the center of the aperture and the central axis 31 of the incident laser beam 24. The totally internal reflection is preferably used for this purpose.
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公开(公告)号：DE69822362T2
公开(公告)日：2005-02-17
申请号：DE69822362
申请日：1998-04-29
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT A
Abstract: The invention comprises a spatial filter and a method of spatially filtering a laser beam, particularly a high power laser beam. High spatial frequency light is nonabsorptively diverted away from low spatial frequencies. The invention provides a method of writing gratings in optical waveguide fiber that results in improved grating performance.
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公开(公告)号：AU3901897A
公开(公告)日：1998-03-06
申请号：AU3901897
申请日：1997-07-29
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT A
Abstract: A variable period amplitude grating mask for use in making a long period Bragg grating is realized by a helically coiled spring. Stretching or compressing the spring changes the periodicity of the mask. A photosensitive optical waveguide, planar or fiber, is positioned within the spring coils along the major axis of the spring. Actinic radiation is incident on the masked waveguide, and induces an index perturbation in the waveguide having the periodicity of the mask. Different spring coil sizes and/or orientation of the waveguide with respect to the mask provide linear and nonlinear (chirped) grating periods. A device and method are described.
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公开(公告)号：AU742070B2
公开(公告)日：2001-12-13
申请号：AU6706898
申请日：1998-05-19
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT ADAM
Abstract: The invention comprises a spatial filter and a method of spatially filtering a laser beam, particularly a high power laser beam. High spatial frequency light is nonabsorptively diverted away from low spatial frequencies. The invention provides a method of writing gratings in optical waveguide fiber that results in improved grating performance.
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公开(公告)号：AU2921297A
公开(公告)日：1997-08-20
申请号：AU2921297
申请日：1997-01-17
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT A
Abstract: Apparatus for forming a refractive index grating in a waveguide in accordance with the invention includes a waveguide formed from a material that changes its index of refraction when exposed to a beam of optical radiation, a source of coherent optical radiation for forming a beam of radiation, a mirror arranged to intercept a first part of a beam and to reflect the first part of the beam through an angle, and a phase delay plate arranged to intercept a second part of the beam for delaying the second part of the beam propagating through the plate, in which the mirror and the phase delay plate are arranged so that the first part of the beam and the second delayed part of the beam form an interference pattern on the waveguide for changing the index of refraction of the waveguide, in a pattern corresponding to the interference pattern for forming an index grating in the waveguide.
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Patent Agency Ranking
公开(公告)号：AU1416697A
公开(公告)日：1997-07-03
申请号：AU1416697
申请日：1996-12-06
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT A
Abstract: An optical coupler 10 has two fibers 20, 30 that are adjacent each other in a coupling region 12. One of the fibers has a clad doped with a photosensitive glass, such as germania. The photosensitive glass is exposed to suitable radiation to alter the index of refraction of fiber and tune the coupler 10 to the selected coupling frequency.
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公开(公告)号：DE69822362D1
公开(公告)日：2004-04-22
申请号：DE69822362
申请日：1998-04-29
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT A
Abstract: The invention comprises a spatial filter and a method of spatially filtering a laser beam, particularly a high power laser beam. High spatial frequency light is nonabsorptively diverted away from low spatial frequencies. The invention provides a method of writing gratings in optical waveguide fiber that results in improved grating performance.
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公开(公告)号：AU4852399A
公开(公告)日：2000-01-24
申请号：AU4852399
申请日：1999-06-30
Applicant: CORNING INC
Inventor： BHATIA VIKRAM , COOK THOMAS A , MODAVIS ROBERT A , ROBSON CHRISTOPHER D
Abstract: Filter gratings are formed in optical waveguides (50) having photosensitive cores by exposing the cores to actinic radiation in the form of interfering beams (38, 40) having peak intensities (72, 74) that are relatively displaced along an optical axis (64) of the waveguides. Each of the interfering beams has a single-lobed intensity profile and a degree of spatial coherence required to achieve a desired fringe contrast between the two relatively displaced beams. Index modulations in the photosensitive core match the illumination (interference) pattern of the radiation. The relative displacement of the interfering beams reduces side lobes of the gratings' spectral responses by leveling the average refractive index of the index modulations. A second exposure with the two beams but without the beams' interference effects further levels the average refractive index.
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公开(公告)号：ID20355A
公开(公告)日：1998-12-03
申请号：ID980745
申请日：1998-05-19
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT A
Abstract: The invention comprises a spatial filter and a method of spatially filtering a laser beam, particularly a high power laser beam. High spatial frequency light is nonabsorptively diverted away from low spatial frequencies. The invention provides a method of writing gratings in optical waveguide fiber that results in improved grating performance.
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公开(公告)号：BR9801659A
公开(公告)日：1999-09-21
申请号：BR9801659
申请日：1998-05-18
Applicant: CORNING INC
Inventor： COOK THOMAS A , MODAVIS ROBERT A
Abstract: The invention comprises a spatial filter and a method of spatially filtering a laser beam, particularly a high power laser beam. High spatial frequency light is nonabsorptively diverted away from low spatial frequencies. The invention provides a method of writing gratings in optical waveguide fiber that results in improved grating performance.
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