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对光纤激光极限功率的探索和其受限因素的分析,有利于为大功率光纤激光器的发展提供理论依据和实验指导.本文考虑热效应、光效应、非线性效应和抽运亮度等因素对光纤激光极限功率的影响,分析了掺镱和掺铥光纤的极限功率和受限因素.在此基础上,结合激光在光纤中单模传输的条件,计算了单模掺镱和掺铥光纤激光的极限功率.计算结果表明,在现有技术条件下,使用常规的976 nm和793 nm激光二极管抽运,单模掺镱和掺铥光纤激光的极限功率分别为4.2 kW和7.8 kW,其中单模掺铥光纤激光的功率水平还远低于它的极限功率的原因是受抽运亮度的限制.最后分析指出减小纤芯的数值孔径和改进少模光束的光束质量是提升单模光纤激光极限功率的重要途径.
The research on the ultimate power of fiber laser and the analysis of its limited factors are helpful to provide theoretical basis and experimental guidance for the development of high power fiber laser.In this paper, considering the thermal effects, light effects, nonlinear effects and pumping brightness and other factors on the fiber laser The limit power and the limiting power of Yb-doped and Yb-doped fibers are analyzed.On the base of this, the limit of single-mode Yb-doped and Yb-doped fiber laser is calculated based on the single-mode transmission of laser in the fiber Power.The calculated results show that under the prior art conditions, using the conventional 976 nm and 793 nm laser diode pumping, the limiting power of single-mode and ytterbium-doped fiber lasers are 4.2 kW and 7.8 kW respectively,原 The reason why the power level of fiber laser is far lower than its limit power is limited by the pumping brightness.The last analysis points out that reducing the numerical aperture of the fiber core and improving the beam quality of the small mode laser is the key to improve the laser limit power of single mode fiber Important way.