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随着光纤技术的不断发展,光纤激光器以其体积小、结构紧凑、高效率、光束质量好、高稳定性等优点逐渐受到重视。近些年,具有高峰值功率、高重复频率和高单脉冲能量的脉冲光纤激光器越来越成为研究和应用领域的热点。利用自行搭建的环形腔光纤激光器,获得了稳定的自启动锁模脉冲种子源,以掺Yb双包层光纤为增益介质,采用包层泵浦的方式和主振荡功率放大结构(MOPA),通过两级放大,使平均功率为70 mW的信号光得到25.2 dB的增益,获得了平均功率23.07 W,中心波长1 064 nm、重复频率41.3 MHz,脉冲宽度50 ps,单脉冲能量0.56μJ,峰值功率11.2 kW的锁模脉冲激光,光光转换效率为42.4%,实现了全光纤结构的锁模脉冲放大器。
With the continuous development of optical fiber technology, fiber lasers are gaining more and more attention due to their small size, compact structure, high efficiency, good beam quality and high stability. In recent years, pulsed fiber lasers with high peak power, high repetition rate and high single-pulse energy have increasingly become the focus of research and applications. A self-starting mode-locked pulse seed source is obtained by using a self-built ring-cavity fiber laser. A cladding pumped mode and a main oscillating power amplifier structure (MOPA) are adopted by adopting a Yb double-clad fiber as a gain medium, Two stages of amplification, the average power of 70 mW signal gain of 25.2 dB gain, the average power of 23.07 W, the center wavelength of 1 064 nm, the repetition frequency of 41.3 MHz, the pulse width of 50 ps, single pulse energy of 0.56 μJ, the peak power The 11.2kW mode-locked pulsed laser achieves 42.4% optical conversion efficiency and realizes a mode-locked pulse amplifier with all-fiber structure.