Optical: systems and elements – Optical amplifier – Beam combination or separation
Reexamination Certificate
2006-10-05
2008-03-04
Hughes, Deandra M (Department: 3663)
Optical: systems and elements
Optical amplifier
Beam combination or separation
Reexamination Certificate
active
07339727
ABSTRACT:
A system and method for combining plural low power light beams into a coherent high power light beam. Optical amplifiers transmit a plurality of light beams propagating at a common wavelength through an array of optical fiber emitters. Each constituent beam is emitted from the array at a different propagation angle, collimated, and incident on a diffractive optical element operating as a beam combiner such that incident beams when properly phased and located are combined into a coherent beam at a desired diffraction order. A beam splitter or a periodic sampling grating on the diffractive optical element directs a low power sample beam to a spatial filter passing resonant mode output back to the optical amplifiers in a ring laser configuration thereby passively synchronizing phases of the constituent beams to maximize combination efficiency of the coherent beam.
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Rice Robert R.
Rothenberg Joshua E.
Shakir Sami A.
Wickham Michael G.
Hughes Deandra M
Northrop Grumman Corporation
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