Air-clad chirally-coupled-core Yb-fiber femtosecond oscillator with >10W average powerHung-Wen Chen, Guoqing Chang, Cheng Zhu, Xiuquan Ma, Almantas Galvanauskas and Franz X. KärtnerEPJ Web of Conferences, 41 (2013) 10006DOI: https://doi.org/10.1051/epjconf/20134110006