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8 November 2012 All-solid photonic bandgap fibers for high power lasers
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There are still very strong interests for power scaling in high power fiber lasers for a wide range of applications in medical, industry, defense and science. In many of these lasers, fiber nonlinearities are the main limits to further scaling. Although numerous specific techniques have studied for the suppression of a wide range of nonlinearities, the fundamental solution is to scale mode areas in fibers while maintaining sufficient single mode operation. Here the key problem is that more modes are supported once physical dimensions of waveguides are increased. The key to solve this problem is to look for fiber designs with significant higher order mode suppression. In conventional waveguides, all modes are increasingly guided in the center of the waveguides when waveguide dimensions are increased. It is hard to couple a mode out in order to suppress its propagation, which severely limits their scalability. In an all-solid photonic bandgap fiber, modes are guided due to anti-resonance of cladding photonic crystal lattice. This provides strongly modedependent guidance, leading to very high differential mode losses. In addition, the all-solid nature of the fiber makes it easily spliced to other fibers. In this paper, we will show for the first time that all-solid photonic bandgap fibers with effective mode area of ~800m2 can be made with excellent higher order mode suppression.
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Liang Dong, Kunimasa Saitoh, Fanting Kong, Paul Foy, Thomas Hawkins, Devon Mcclane, and Guancheng Gu "All-solid photonic bandgap fibers for high power lasers", Proc. SPIE 8547, High-Power Lasers 2012: Technology and Systems, 85470J (8 November 2012);

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