1 June 2005 Fiber laser with in-cavity polarization switching
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In this work, we demonstrate how a polarization switching technique can be used to create multiple fiber ends, and allow the radiation to pass twice through each amplifying section for more efficient energy extraction. The technique uses a polarizing beam splitter combined with polarization switching in each arm of the cavity to define a ring-like cavity with multiple gain sections that can be end pumped. Polarization-maintaining double-clad rare-earth-doped fiber with slightly multi-mode core was used as the gain sections. A laser system based on the in-cavity polarization switching design has been demonstrated with maximum measured 62% slope efficiency and close to 30W output. The relatively low output power is only limited by the available pump sources.
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Xiaojun Li, Xiaojun Li, Theodore F. Morse, Theodore F. Morse, Fei Luo, Fei Luo, Stephen B. Ippolito, Stephen B. Ippolito, } "Fiber laser with in-cavity polarization switching", Proc. SPIE 5792, Laser Source and System Technology for Defense and Security, (1 June 2005); doi: 10.1117/12.604590; https://doi.org/10.1117/12.604590

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