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采用内包层直径为125μm的双包层掺镱光纤,搭建了谐振腔结构全光纤激光器系统,获得了1018 nm的高功率激光输出。通过优化光纤长度和控制抽运源波长,单模激光输出功率为254 W,光光转换效率达到81%,光谱中无自发辐射光和剩余抽运光,信噪比大于35 d B。由于抽运半导体激光器的输出波长随着输出功率变化,光纤激光器的转换效率也将改变,为了提高转换效率,抽运半导体激光器的输出波长需要精确控制;光纤激光器长期稳定性测试结果表明,4 h连续工作的不稳定度小于0.5%。本光纤激光器系统是同带抽运高功率光纤激光器的理想抽运源。
A double - clad Yb - doped fiber with an inner cladding diameter of 125μm was used to build an all - fiber laser system with a resonator structure and a high power laser output of 1018 nm was obtained. By optimizing the fiber length and controlling the pumping source wavelength, the single-mode laser output power is 254 W and the light-to-light conversion efficiency reaches 81%. There is no spontaneous emission and residual pumping light in the spectrum, and the signal-to-noise ratio is greater than 35 dB. Since the output wavelength of the pump semiconductor laser varies with the output power, the conversion efficiency of the fiber laser will also change. In order to improve the conversion efficiency, the output wavelength of the pump semiconductor laser needs to be precisely controlled. The long- The instability of continuous work is less than 0.5%. The fiber laser system is an ideal pumping source for pumping high-power fiber lasers.