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采用掺钕双包层大模场保偏光子晶体光纤(PCF)作为增益介质,实现了1.06μm连续激光运转。实验采用线型谐振腔,光纤一端研磨成0°角作为自由耦合输出端,并提供4%的反馈光用于维持谐振腔内的激光振荡。激光器阈值为2.4 W,斜效率为18.8%。当抽运功率达到30 W时,最大输出功率为4.94 W,光束质量因子为1.30,偏振串音为-7.9dB,输出激光的中心波长为1062.7nm。实验结果表明,掺钕双包层大模场PCF具有良好的单模传输特性和保偏性能,有利于激光器实现高功率高光束质量的激光输出。
The doped neodymium double-clad macroscopic mode Polarization Maintained Photonic Crystal Fiber (PCF) was used as the gain medium to achieve 1.06μm continuous laser operation. The experiment uses a linear resonator with one end of the fiber being ground to a 0 ° angle as the free-coupling output and 4% of the feedback light being used to maintain the laser oscillation in the resonator. The laser threshold is 2.4 W and the ramp efficiency is 18.8%. When the pumping power reaches 30 W, the maximum output power is 4.94 W, the beam quality factor is 1.30, the polarization crosstalk is -7.9 dB, and the output laser has a center wavelength of 1062.7 nm. The experimental results show that NdFeB double-clad PMF has good single mode transmission and polarization maintaining performance, which is good for the laser to achieve laser output with high power and high beam quality.