标题：Evanescent coupling in buried planar waveguide arrays written by a femtosecond laser in neodymium-doped yttrium lithium fluoride (Nd:YLiF4)
作者：Liu, Xiaoyu ;Qu, Shiliang ;Tan, Yang ;Chen, Feng
作者机构：[Liu, Xiaoyu ;Qu, Shiliang ] Department of Physics, Harbin Institute of Technology, Harbin 150001, China;[Tan, Yang ;Chen, Feng ] School of Physics, S 更多
来源：Journal of Physics D: Applied Physics
摘要：We report on the fabrication of buried planar waveguide arrays in neodymium-doped yttrium lithium fluoride (Nd:YLiF4) by femtosecond laser writing. With optimized fabrication parameters, the individual waveguide modes are coupled to each other through the evanescent tails of adjacent guided fields, while the coupling constant is calculated to be 1.18cm1at 633nm based on coupled-mode theory, which shows good agreement with the experiment results. Micro-luminescence spectra reveal that the Nd3+fluorescence properties are not significantly affected by the waveguide formation processing, which indicates a fairly good potential for further laser actions in a compact device. © 2011 IOP Publishing Ltd.