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1. (WO2017155626) WAVEGUIDE DESIGN FOR LINE SELECTION IN FIBER LASERS AND AMPLIFIERS

Pub. No.:    WO/2017/155626    International Application No.:    PCT/US2017/015577
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Tue Jan 31 00:59:59 CET 2017
IPC: H01S 3/067
G02B 6/02
G02B 6/14
H01S 3/16
Applicants: LAWRENCE LIVERMORE NATIONAL SECURITY, LLC
Inventors: PAX, Paul H.
ALLEN, Graham S.
DAWSON, Jay W.
DRACHENBERG, Derrek Reginald
KHITROV, Victor V.
MESSERLY, Michael J.
SCHENKEL, Nick
Title: WAVEGUIDE DESIGN FOR LINE SELECTION IN FIBER LASERS AND AMPLIFIERS
Abstract:
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.