Gain competition induced mode evolution and resonance control in erbium-doped whispering-gallery microresonators Liu, Xiao-Fei ; Lei, Fuchuan ; Gao, Ming ; Yang, Xu ; Wang, Chuan ; Özdemir, Şahin Kaya ; Yang, Lan ; Long, Gui-Lu Abstract Publication: Optics Express Pub Date: May 2016 DOI: 10.1364/OE.24.009550 Bibcode: 2016OExpr..24.9550L