多点侧面泵浦双包层光纤激光器的对称夹层结构

 利用基于亚波长衍射光栅理论的介质-金属-介质的对称夹层结构,对掺杂的双包层光纤进行多点泵浦，根据严格的电磁场衍射理论和光栅方程，分析了多点泵浦时，这种耦合结构的泵浦光泄露的问题，证明了多点泵浦时泵浦光的泄露率仅为15.52%，而对信号光则不存在泄露。这种对称夹层结构可以用于多个大功率激光二极管阵列的多点侧面泵浦双包层掺杂光纤中，以制作各种大功率(数kW级)稀土光纤激光器，其最大耦合效率可以达到80%以上。

Pump light leakage at coupler of side-pumped double-clad fiber laser with a novel dielectric-metal-dielectric sandwich structure

A multi-coupler side-pumped rare-earthdoped double-clad fiber laser with a novel dielectric-metal-dielectric(DMD) sandwich structure based on the theory of sub-wavelength diffraction grating is presented.A rigorous electromagnetic theory which considers the vectorial character of the light has been used to investigate and compute its pump light leakage at adjacent coupler for every coupled structure and it is found that pump light leakage is only 15.52% with a angle perpendicular to side of fiber.So this DMD sandwich structure can be applied to multi-point side-pump double-clad fiber laser effectively and the maximum coupling efficiency is greater than 80% after the second diffraction.