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搭建了一台主振荡功率放大(MOPA)结构的单模线偏振窄线宽纳秒脉冲全光纤放大器,理论仿真和实验结果较为吻合。通过声光调制器(AOM)对连续单频1 064 nm激光进行调制,获得了重复频率50 k Hz、平均功率25μW的脉冲激光,作为放大器的种子源。对预放大过程中非线性效应、放大自发辐射、自激振荡及泵浦饱和问题进行了仿真分析。随后对种子光进行功率放大,通过光纤内参数的有效优化,进一步抑制了自激振荡,提升了弱信号的放大倍率。实验实现了脉冲宽度64 ns、平均功率75 m W的脉冲激光输出。最后,对亚毫瓦弱信号放大器中决定系统性能的关键因素进行了总结。
A single mode linear polarization nanosecond pulse all-fiber amplifier with a single-mode line with a main oscillator power amplifier (MOPA) structure is built. The theoretical simulation and experimental results are in good agreement. A continuous single-frequency 1 064 nm laser was modulated by AOM to obtain a pulsed laser with a repetition rate of 50 k Hz and an average power of 25 μW as the seed source of the amplifier. The nonlinear effects in the pre-amplification process, amplification spontaneous emission, self-excited oscillation and pump saturation are simulated and analyzed. Then, the seed light is amplified by power, the self-oscillation is further suppressed and the magnification of the weak signal is improved by the effective optimization of the optical fiber internal parameters. Experimental results show that the pulse laser output is 64 ns with average power of 75 mW. Finally, the key factors determining system performance in the sub-milliwatt weak signal amplifier are summarized.