10 February 2011 Advanced specialty fiber designs for fiber lasers
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Abstract
Progress in advanced specialty fibers is the foundation to further breakthroughs in fiber lasers. Recently, we have been working to advance several areas of developments in specialty fibers and would like to review these efforts here. The first topic is in the further development of all-glass large core leakage channel fibers (LCF) for robust and practical solutions for power scaling. The second area is the development of wide band air-core fibers with an innovative square lattice cladding and the demonstration of a factor of two improvements in bandgap over conventional hexagonal lattice. These air-core fibers are critical for fiber delivery solution of both CW and pulsed fiber lasers in the future. The last topic is a new development in design and simulation of SBS gains in optical fibers by incorporating leaky acoustic modes. These leaky acoustic modes have been mostly overlooked so far. It is essential that they are considered in SBS simulations in fibers, because they are normal solutions to the acoustic waveguide equations and have similar loss to guided acoustic modes where the acoustic mode loss is dominated by material loss. This leads to much improved resolution of SBS gain spectrum in fibers and to new design insights to the limit of SBS suppression based on anti-guide acoustic waveguide designs.
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Liang Dong, Hugh A. McKay, B. K. Thomas, Libin Fu, Shigeru Suzuki, Michiharu Ohta, Andrius Marcinkeivicius, "Advanced specialty fiber designs for fiber lasers", Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 791415 (10 February 2011); doi: 10.1117/12.878831; https://doi.org/10.1117/12.878831
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