Narrow band laser speckle suppression
AssigneeUnited States of America
InventorsLynda E. Busse, Ishwar D. Aggarwal, John A. Moon
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Abstract
A method and apparatus for reducing points of zero intensity, i.e. speckle pattern, emerging from a multimode fiber. The apparatus comprises a beam deflector for rotating an input beam in a conical shape around a launch lens for projecting the beam into the fiber. The rotation of the beam further incorporates the use of two tilting mirrors being 90° out of phase to ensure a conical rotation. The conical rotation of the beam deflector ensures that the lens aberrations, which are rotationally symmetric, do not play a factor in beam alignment into the fiber aperture.
Claims16
A method for suppressing laser pulse at an output of a short multimode optical fiber, comprising the steps of:
- projecting a laser beam into a multimode fiber by means of a plurality of lenses;
- and changing a launch angle of the laser beam.
An apparatus for reducing points of zero intensity emerging from a multimode fiber, comprising:
- an input laser beam;
- an input lens;
- a launch lens;
- a multimode fiber;
- and
- a means for deflecting the input beam.
Dependencies are inferred from the claim text.