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基础科学研究和超精细工业加工领域的发展迫切需要高重复频率、高功率的飞秒脉冲激光。采用啁啾脉冲放大技术,以掺镱双包层光子晶体光纤作为增益介质,搭建了高平均功率飞秒脉冲光纤激光系统。系统包括被动锁模振荡器、脉冲展宽器、单模光纤预放大器、光子晶体光纤功率放大器和脉冲压缩器5部分。实验上获得了重复频率40 MHz、平均功率150 W、脉冲宽度273 fs的超短脉冲输出。整个系统置于3 m×1.5 m的光学平台上,通过模块化和集成化的改进,该系统体积有望大幅度减小,为科学研究和工业应用提供有力工具。
The development of basic science research and ultra-fine industrial processing urgently needs high repetition rate and high power femtosecond pulsed laser. By using chirped pulse amplification technology and using ytterbium-doped double-clad photonic crystal fiber as the gain medium, a high average power femtosecond pulsed fiber laser system is set up. The system consists of passive mode-locked oscillator, pulse stretcher, single-mode fiber preamplifier, photonic crystal fiber power amplifier and pulse compressor 5 parts. Experimental results show that the output frequency is 40 MHz, the average power is 150 W and the pulse width is 273 fs. The whole system is placed on an optical platform of 3 m × 1.5 m. With the improvement of modularization and integration, the volume of the system is expected to be greatly reduced, providing a powerful tool for scientific research and industrial applications.