SPACE FILTER FOR HIGH-OUTPUT LASER BEAM

    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

    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.

    5.
    发明专利
    未知

    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

    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.

    METHOD OF WRITING PHOTOSENSITIVE GRATING USING LLOYD'S MIRROR

    公开(公告)号:CA2215662A1

    公开(公告)日:1997-07-31

    申请号:CA2215662

    申请日:1997-01-17

    Applicant: CORNING INC

    Abstract: Apparatus for forming a refractive index grating in a waveguide (10) in accordance with the invention includes a waveguide (10) formed from a material that changes its index of refraction when exposed to a beam of optical radiation (20), a source of coherent optical radiation for forming a beam of radiation, a mirror (12) 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 (22) 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 (12) and the phase delay plate (22) 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 (10).

    9.
    发明专利
    未知

    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

    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.

    10.
    发明专利
    未知

    公开(公告)号:BR9914872A

    公开(公告)日:2001-07-03

    申请号:BR9914872

    申请日:1999-10-07

    Applicant: CORNING INC

    Abstract: Optical gratings having a range of possible Bragg wavelengths can be produced using a single phase mask by exposing the mask to a non-collimated spatially filtered beam of light. A spatial filter removes high spatial frequency components from the beam, and a focusing system directs the filtered beam to a phase mask. A rate at which the beam is focused and a spacing between the phase mask and a photo-sensitive waveguide are varied to produce gratings in the waveguide having a range of possible periods.

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