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Raman beam combining for laser brightness enhancement

United States Patent

October 27, 2015
View the Complete Patent at the US Patent & Trademark Office
Lawrence Livermore National Laboratory - Visit the Industrial Partnerships Office Website
An optical source capable of enhanced scaling of pulse energy and brightness utilizes an ensemble of single-aperture fiber lasers as pump sources, with each such fiber laser operating at acceptable pulse energy levels. Beam combining involves stimulated Raman scattering using a Stokes' shifted seed beam, the latter of which is optimized in terms of its temporal and spectral properties. Beams from fiber lasers can thus be combined to attain pulses with peak energies in excess of the fiber laser self-focusing limit of 4 MW while retaining the advantages of a fiber laser system of high average power with good beam quality.
Dawson; Jay W. (Livermore, CA), Allen; Graham S. (Pleasanton, CA), Pax; Paul H. (Livermore, CA), Heebner; John E. (Livermore, CA), Sridharan; Arun K. (Fremont, CA), Rubenchik; Alexander M. (Livermore, CA), Barty; Chrisopher B. J. (Hayward, CA)
Lawrence Livermore National Security, LLC (Livermore, CA)
13/ 771,770
February 20, 2013
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT The United States Government has rights in this invention pursuant to Contract No. DE-AC52-07NA27344 between the U.S. Department of Energy and Lawrence Livermore National Security, LLC, for the operation of Lawrence Livermore National Laboratory.