Single-mode ytterbium-doped phosphate all-solid photonic crystal fiber (AS-PCF) with 13.8 W output power and 32% slope efficiency was reported. By altering the diameter of the rods around the doped core and thus breaking the symmetry of the fiber, a polarization-maintaining AS-PCF with degree of polarization of >85% was also achieved, for the first time to knowledge, in a phosphate PCF.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4329557 | PMC |
| http://dx.doi.org/10.1038/srep08490 | DOI Listing |
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