为了解决万瓦级激光光闸耦合效率实时监测的难题, 采用通过实时探测光闸输出端工作光纤内部的后向散射光来监测耦合效率从而防止其耦合失效的安全控制方法, 仿真并建立了耦合偏差与后向散射光光强信号之间的映射规律与模型, 并基于此设计了相应的光闸耦合失效的安全控制系统。结果表明, 高功率激光光闸在安全控制系统的保证下能长期承载12kW以上功率, 并且耦合效率稳定在98%以上, 证明了该方法的有效性。该研究可以保证万瓦级激光光闸长期工作的高效性、稳定性及安全性, 促进我国激光制造领域关键部件的自主化。

In order to solve the problem of real-time monitoring the coupling efficiency of 10kW-level optic switch, a safety control method was adopted to monitor the coupling efficiency by detecting the backscattered light inside the working fiber at the output end of the optic switch in real time, and then its coupling failure was prevented. The mapping law and model between coupling errors and signal of backscattered light intensity were simulated and established. Furthermore, the safety control system of the optic switch was designed. And the effectiveness of the method was proved through the simulations and experiments. The results show that the high-power optic switch can carry more than 10kW power for a long time under the guarantee of the safety control system, and the coupling efficiency is stable above 98%. This research can ensure the long-term efficiency, stability and safety of 10kW-level optic switch. It can promote the autonomy of key components in the field of laser manufacturing in China.