红外与激光工程, 2016, 45 (1): 0105004, 网络出版: 2016-04-05  

高功率非对称泵浦耦合器理论研究

Theoretical research of high-power asymmetric pump combiner
作者单位
北京工业大学 激光工程研究院,北京 100124
摘要
高功率非对称泵浦耦合器是高功率连续光纤激光器的关键无源光器件,它可以将多路泵浦光高效率地耦合进主光纤中,从而为光纤激光器提供所需的泵浦光功率,但已有双波导耦合理论并不能直接应用于该型耦合器的研究。为解决这一问题,在双波导定向耦合器的不完全耦合理论基础上,针对高功率泵浦耦合器非对称的特点,将其耦合系数和光功率方程组做了进一步推导,并进行了数值仿真,研究结果表明:两光纤中的光功率按照一定周期变化,当泵浦光纤的锥角在1°~1.5°之间时,可以获得97%以上的最佳耦合效率,且与其对应耦合长度的局部变化对耦合效率的影响较小。该研究结果对高功率非对称泵浦耦合器的设计及制作均具有指导意义。
Abstract
High-power asymmetric pump combiner is the key passive optical device of the high-power continuous all-fiber laser. Multiple pump lights are efficiently coupled into the main fiber through the high-power asymmetric pump combiner, so that enough pump powers are provided for the high-power fiber laser. The current coupling theory of the double waveguide directional combiner can′t be directly applied to the study of the high-power asymmetric pump combiner. In order to solve this problem, the incomplete coupling theory of the double waveguide directional combiner was used as the foundation and the asymmetry was used as the feature of the high-power pump combiner. The coupling coefficients equations and the power equations of the high-power asymmetric pump combiner were further derived and the simulation results were also obtained. The conclusions are as follows. The powers of the pump fiber and the main fiber change periodically. When the taper angle of the pump fiber is between 1° and 1.5°, more than 97% coupling efficiency is obtained. The local variation of the coupling length has little effect on the coupling efficiency. The conclusions are instructive for the designs and productions of high-power fiber coupler.

谭祺瑞, 葛廷武, 王智勇. 高功率非对称泵浦耦合器理论研究[J]. 红外与激光工程, 2016, 45(1): 0105004. Tan Qirui, Ge Tingwu, Wang Zhiyong. Theoretical research of high-power asymmetric pump combiner[J]. Infrared and Laser Engineering, 2016, 45(1): 0105004.

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