Method and apparatus for optimizing the target intensity distribution transmitted from a fiber coupled array
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United States of America Patent
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Oct 16, 2007
Grant Date -
Sep 20, 2007
app pub date -
Sep 15, 2005
filing date -
Sep 15, 2005
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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.
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