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US 8,786,940 B2Granted
Despeckling apparatus and method
AssigneeLaser Light Engines, Inc.
InventorsBarret Lippey, William Beck, Ian Turner
Life of this patent
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Abstract
An apparatus and method that reduces laser speckle by using stimulated Raman scattering in an optical fiber. The fiber core diameter and length are selected to achieve a desired output color. An adjustable despeckler is formed by combining two optical fibers in parallel and adjusting the amount of light in each path.
Claims7
An optical apparatus comprising:
- an optical fiber;
- and
- a red light source;
- wherein a stimulated Raman scattering in the optical fiber reduces a speckle characteristic of a light output from the optical fiber, a core diameter and a length of the optical fiber are selected to achieve a desired color of the light output, the desired color of the light output is a primary color, the primary color is a green color, a portion of the stimulated Raman scattering forms a red stimulated Raman scattering light, and the red light source is combined with the red stimulated Raman scattering light.
1 more element
An optical apparatus comprising:
- a first optical fiber;
- wherein a stimulated Raman scattering in the first optical fiber reduces a first speckle characteristic of a first light output from the first optical fiber;
- a second optical fiber;
- and
- a variable light splitter;
- wherein the variable light splitter illuminates the first optical fiber and the second optical fiber, and a stimulated Raman scattering in the second optical fiber reduces a second speckle characteristic of a second light output from the second optical fiber.
3 more elements
A method of despeckling comprising:
- generating a first laser beam;
- splitting the first laser beam into second and third laser beams;
- focusing the second laser beam into a first optical fiber;
- generating a first stimulated Raman scattering light in the first optical fiber;
- focusing the third laser beam into a second optical fiber;
- generating a second stimulated Raman scattering light in the second optical fiber;
- combining the first stimulated Raman scattering light and the second stimulated Raman scattering light to form a combined stimulated Raman scattering light;
- using the combined stimulated Raman scattering light to form a projected digital image;
- and
- adjusting the amount of light in the second laser beam and the third laser beam to achieve a desired color for a primary color in the projected digital image.
7 more elements
Dependencies are inferred from the claim text.