透镜导管在多芯光子晶体光纤激光器Talbot外腔选模中的应用

Multi-cores PCF laser mode selection with Talbot cavity based on lens tube

Talbot自成像技术因为原理简单、易于搭建等特点,常被用于多芯光子晶体光纤激光器的选模,但这种技术仍然存在选模效率不高的问题。采用透镜导管的镜面反射原理对其进行改进,该技术能有效利用出射光束,降低选模损耗。使用有限元方法对一种18芯光子晶体光纤激光器进行模式分析,并对各种模式在所设计结构中的传输进行了计算,结果表明改进后的技术可以提高选模效率。

Talbot self-imaging technique was often used in mode selection of multicores photonic crystal fiber laser because of simple principle and easy building. However, the technique has high energy loss in mode selection. A kind of technique based on lens tube was proposed to exploit laser beam high efficiency and loss decreasing. The super- modes of an 18-cores Yb3 ＋ doped photonic crystal fiber （PCF） were analyzed numerically by using finite element method. Compared to the general Talbot cavity technology, the new structure was used in the supermodes and result showed the new structure can increase mode selection efficiency.