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研究了输出功率1 kW的连续全光纤激光器的实现方法。采用双端泵浦单谐振腔方式,通过优化增益光纤及光纤光栅参数,实现了工作波长1.08μm,最大输出功率1.03 kW的全光纤连续激光输出,光-光转换效率74.6%,斜效率75%。输出功率为272 W时光束质量M2x=1.39,M2y=1.43。分析了光束质量变差的原因,认为在高功率下光纤光栅、合束器及熔点导致原先在纤芯中传输的激光部分被泄露到包层中,在包层中传输的激光使光束质量变差。提出了进一步改进的方法。
The realization method of continuous all-fiber laser with 1 kW output power is studied. By using double-ended pumping single-cavity method, all-fiber continuous laser with working wavelength of 1.08μm and maximum output power of 1.03 kW is realized by optimizing gain fiber and fiber grating parameters. The light-to-light conversion efficiency is 74.6% and the slope efficiency is 75% . Beam quality M2x = 1.39 and M2y = 1.43 at 272 W output power. Analysis of the reasons for the deterioration of the beam quality, that the high-power fiber grating, beam splitter and the melting point led to the original transmission in the core part of the laser is leaked into the cladding, laser cladding in the transmission of the beam quality change difference. Proposed a method of further improvement.