双包层光纤侧面耦合器

研究了一种侧面抽运双包层光纤的方法，从被剥除了外包层、端面为350μm×400μm的D型双包层光纤内包层上切下长度为3mm的一段柱体，并胶合在相同的双包层光纤内包层的侧面上，构成了柱体-光纤侧面耦合器。半导体激光器的抽运光从该柱体的一端入射并通过它耦合进入双包层光纤的内包层，实验测得耦合器最大耦合效率为85％。该方法适用于输出功率为数瓦的光纤激光器和放大器的侧面抽运。

A new method for side-pumping double-cladding fiber is researched. A column of 3 mm length is cut off from D-shape double-cladding fiber which has a transverse sectional dimension of 350 μm×400 μm. Then the column-fiber coupler is formed by gluing the column onto the side of inner cladding. The pumping light is coupled into the inner cladding from the end of column. When the output power is 1.3 W from the forward end of the coupler, the optimum efficiency is 85%. This method suits for pumping the fiber laser and amplifier of several watts output power.