单模掺铒光纤激光器极限输出功率的数值研究

Numerical study on power limit of single-mode Er-doped fiber lasers

通过对掺铒光纤激光器极限输出功率的受限因素分析,在考虑非线性效应、热效应、光损伤等因素的情况下,结合掺铒光纤激光器的单模条件,计算得到单模掺铒光纤激光在1570nm工作波段下的极限功率为6.34kW。同时计算了在少模条件下掺铒光纤激光器的极限输出功率为53.39kW。还分析了单频情况下掺铒光纤激光器的极限输出功率,结果表明:在绝对单频的条件下,掺铒光纤激光器的极限输出功率为245W。并重点对实际中可行的提升输出极限功率的改善方法进行了分析,结果表明:降低纤芯数值孔径以及提升少模光束运转下的光束质量是提升单模条件下掺铒光纤激光器极限输出功率的重要手段。

The numerical analyzing about the influence factors on limiting the output power of erbium doped fiber laser, considering the nonlinear effect, the thermal effect and the facet damage as well as combining the single mode condition, the single mode erbium doped fiber laser was simulated to get a maximum extractable power of 6.34 kW operating at 1 570 nm. Besides, in less mode condition, maximum extractable power of the erbium doped fiber laser can reached 53.39 kW. The limited output power in single frequency condition was simulated and the results show that in absolutely single frequency condition, the power limit of erbium doped fiber laser was 245 W. At last, the fact working condition was analyzed and the promoting methods of power was focused on. As results, decreasing the core numerical aperture （NA） and promoting the beam quality in less mode condition can be effective ways to gain the limited output power.