Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2007-10-16
2007-10-16
Font, Frank G. (Department: 2883)
Optical waveguides
With optical coupler
Input/output coupler
C385S039000, C359S708000, C359S717000, C359S754000
Reexamination Certificate
active
11227898
ABSTRACT:
Encircled far field energy is substantially increased by modifying the near field energy distribution of radiation from each fiber in an emitting array. Each beamlet output from a fiber is modified to have a generally uniform cross-sectional energy distribution, using a pair of aspheric optical elements selected for that purpose. The optical elements may be refractive or reflective. The modified beamlets combine to form a composite output beam with a generally uniform energy distribution. Preferably, the composite beam is subject to an array-wide inverse transformation to a near-Gaussian distribution, further enhancing the encircled far field energy and providing a more efficient high power laser source. Further gains in efficiency are achieved by selecting a fiber bundle pattern, lens array pattern and lens shape that together result in a high fill factor.
REFERENCES:
patent: 3476463 (1969-11-01), Cohn
patent: 6639733 (2003-10-01), Minano et al.
patent: 6980717 (2005-12-01), Watanabe et al.
John A. Hoffnagle et al., “Design and performance of a refractive optical system that converts a Gaussian to a flattop beam” Appl. Optics, vol. 39, No. 30, pp. 5488-5499, Oct. 2000.
Brosnan Stephen J.
Komine Hiroshi
Wickham Michael G.
Carmen B. Patti & Assoc. LLC
Font Frank G.
Mooney Michael P.
Northrop Grumman Corporation
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