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掺铥光纤激光器可广泛应用于激光医疗、人眼安全雷达、非金属材料加工、光电对抗等众多领域,具有其他波段光纤激光器不可替代的重要作用。主要介绍了本课题组在高功率超短脉冲掺铥光纤激光器方面的研究进展,包括利用光纤布拉格光栅控制锁模掺铥光纤振荡器的脉冲宽度和光谱形状,实现了2μm波段高重复频率、高稳定性的皮秒脉冲激光输出。同时,采用该皮秒脉冲激光作为种子源,研制出了百瓦量级全光纤结构的皮秒掺铥光纤放大器,最后一级功率放大器的最大平均输出功率为120.4W,脉冲宽度为16ps。此外,设计并搭建了全光纤全保偏结构的皮秒掺铥光纤放大系统,实现了平均功率为240 W的线偏振皮秒脉冲激光输出,偏振消光比大于15dB,脉冲宽度为45ps。
The doped 铥 fiber laser can be widely used in many fields such as laser medical treatment, human eye safety radar, non-metallic material processing, photoelectric countermeasure and other irreplaceable functions of other band fiber lasers. This paper mainly introduces the research progress of our group in high-power ultra-short pulse doped 铥 fiber lasers, including the use of fiber Bragg gratings to control the pulse width and spectral shape of the mode-locked fiber 掺 fiber oscillator and achieve high repetition rate of 2μm band, high Stable picosecond pulse laser output. At the same time, using the picosecond pulsed laser as the seed source, picosecond doped 铥 fiber amplifier with 100W all-fiber structure has been developed. The maximum output power of the last stage of the amplifier is 120.4W and the pulse width is 16ps. In addition, a picosecond doped optical fiber amplifier system with all-fiber fully-preserved partial structure is designed and constructed to achieve a linearly polarized picosecond pulse laser output with an average power of 240 W with a polarization extinction ratio greater than 15 dB and a pulse width of 45 ps.