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WAVEGUIDE DESIGN FOR LINE SELECTION IN FIBER LASERS AND AMPLIFIERS

United States Patent Application

20170229834
A1
View the Complete Application at the US Patent & Trademark Office
Lawrence Livermore National Laboratory - Visit the Industrial Partnerships Office Website
Rare earth doped fiber lasers can be robust and efficient sources of high quality light, but are usually limited to the highest gain transitions of the active species. But rare earths typically possess a multitude of potentially useful transitions that might be accessed if the dominant transition can be suppressed. In fiber lasers this suppression is complicated by the very high net gain the dominant transitions exhibit; effective suppression requires some mechanism distributed along the length of the fiber. We have developed a novel waveguide with resonant leakage elements that frustrate guidance at well-defined and selectable wavelengths. Based on this waveguide, we have fabricated a Large Mode Area Neodymium doped fiber with suppression of the four-level transition around 1060 nm, and demonstrated lasing on the three-level transition at 930 nm with good efficiency.
Pax, Paul H. (Livermore, CA), Allen, Graham S. (Pleasanton, CA), Dawson, Jay W. (Livermore, CA), Drachenberg, Derrek Reginald (Livermore, CA), Khitrov, Victor V. (San Ramon, CA), Messerly, Michael J. (Danville, CA), Schenkel, Nick (Livermore, CA)
Lawrence Livermore National Security, LLC (Livermore CA)
15/ 288,590
October 7, 2016
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] 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.