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结合双包层掺镱光纤(YDCF)和主振荡功率放大(MOPA)技术,利用熔融拉锥的光纤侧面耦合器,设计和实验研究了全光纤结构的脉冲光纤放大器。在不同重复频率时,通过放大脉冲激光的输出光谱,对输出脉冲激光中的剩余抽运光和受激拉曼散射光功率进行了修正;并研究了激光脉冲的时域特性,以及在脉冲放大过程中对输出激光脉冲宽度的压缩作用。获得输出放大脉冲激光的主要参数:峰值波长为1075 nm,脉冲宽度为18~300 ns,重复频率为5~20 kHz,峰值功率达9.87 kW,斜率效率达52.2%,光束质量M2=2.0。同时,制作完成了一台结构紧凑、全光纤结构的脉冲光纤放大器样机,其最大外形尺寸为370 mm×270 mm×90 mm。
Combining double-clad Ytterbium-doped fiber (YDCF) with main oscillatory power amplification (MOPA), an all-fiber pulsed fiber amplifier was designed and experimentally investigated by using fiber side coupler with fused taper. At different repetition frequencies, the amplitudes of the output laser pulses and the output laser pulses were modified to obtain the remaining pump light and the stimulated Raman scattered light power. The time-domain characteristics of laser pulses and their effects on pulse amplification Compression of the output laser pulse width during the process. The main parameters of the output amplified pulsed laser are as follows: the peak wavelength is 1075 nm; the pulse width is 18-300 ns; the repetition frequency is 5-20 kHz; the peak power is 9.87 kW; the slope efficiency is 52.2% and the beam quality is M2 = 2.0. At the same time, the prototype of a pulsed fiber amplifier with a compact structure and all-fiber structure was completed. Its maximum dimension is 370 mm × 270 mm × 90 mm.