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提出了一种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,这种结构因为没有使用诸如折射率匹配液、光学固化胶等承受不了较高温度的黏接物质,所以可以用于大功率激光二极管阵列的侧面抽运,尤其可用于条形半导体激光器侧面抽运双包层掺杂光纤中,以制作各种大功率稀土离子掺杂光纤激光器,并且其耦合效率可以达到80%以上。同时,这种侧面抽运技术还支持多点抽运以及光纤两端同时激射高能激光。
A symmetrical sandwich structure based on the theory of subwavelength diffraction grating is proposed. This kind of structure can not be used because it does not support high temperature adhesive materials, such as refractive index matching liquid, optical curing glue, etc. Especially, it can be used in side-pumping double-clad doping fibers on the side of a bar-type semiconductor laser to make various high-power rare earth ion-doped fiber lasers, and the coupling efficiency can reach 80% the above. At the same time, the side pumping technology also supports multi-point pumping and simultaneous lasing of high-energy lasers at both ends of the fiber.