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提出了一种新型的双包层光纤激光器侧面耦合技术一梯形微棱镜侧面耦合技术,能高效且方便地将激光二极管,特别是高功率激光二极管阵列抽运光耦合进双包层光纤中。该技术采用一个与双包层光纤内包层折射率相同的材料加工而成的具有特殊角度的梯形棱柱,其中一个表面镀以特定角度的高反射率光学薄膜,通过梯形微棱镜该镀膜表面的反射,将抽运光耦合到内包层中。详细阐述了微棱镜反射式耦合技术的基本原理和具体使用方法,理论计算所得耦合效率超过90%。通过计算对激光二极管抽运源的线宽、发散角以及梯形微棱镜的具体参数进行了分析,并对该技术的适用范围,包括激光二极管、尾纤输出的激光二极管、激光二极管阵列、各种形状内包层结构等做了进一步讨论。
A novel double-clad fiber laser side-coupling technique, a trapezoidal micro-prism side-coupling technique, is proposed to efficiently and conveniently pump laser diodes, especially high-power laser diode arrays into double clad fiber. The technology uses a double-clad fiber cladding refractive index of the same material processed from a special angle of the trapezoidal prism, one of the surface plated with a specific angle of high reflectivity optical film, through the trapezoidal microprism reflection of the coating surface The pump light is coupled into the inner cladding. The basic principle and specific use of the micro-prism reflective coupling technology are described in detail. The theoretical coupling efficiency is more than 90%. The calculation of the laser diode pumping source linewidth, divergence angle and trapezoidal microprism specific parameters were analyzed, and the application of the technology, including laser diode, pigtail output laser diode, laser diode array, various Shape of the inner cladding structure for further discussion.