光纤激光器凸端面选模理论和实验研究

为了改善光纤激光器的输出光束特性,将光纤端面加工处理成近似凸球面。从实验上研究了光纤端面为凸球面时对光纤激光器输出光束质量和输出功率的影响。在考虑横向空间烧孔效应的速率方程的基础上,建立了光纤激光器端面选模的理论模型,并对凸端面选模方法进行了数值模拟。结果表明,采取凸端面作为光纤激光器的输出端可以提高输出激光的光束质量。

Experimental and Theoretical Study on Mode Selection of Fiber Lasers with Convex Output End

In order to improve the beam properties of fiber lasers, the fiber-end surface is processed similar to a convex spherical surface. The beam quality and the output power of the fiber lasers were studied experimentally. Based on the rate equation with transverse spatial hole burning taken into account, a theoretical model of mode selection with end face for the fiber lasers was set up and the effect was numerically simulated with the fiber convex output end. Numerical simulation and experimental results show that the output beam quality can be improved taking a convex face as the output end of a fiber laser.