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报道了基于主振荡功率放大(MOPA)工作方式的吉赫兹级窄线宽、高峰值功率光纤激光器。该激光器以脉冲调制的分布反馈式单频半导体激光器为种子源,波长为1064.12nm,脉冲宽度为3.92ns,重复频率在10~50kHz内连续可调。采用光纤双程放大结构的预放大级以增加小信号放大能力并抑制强抽运下的自发放大辐射,优化功率放大级光纤长度以抑制窄线宽激光放大过程中的受激布里渊散射,在重复频率为10kHz时,获得光谱线宽为1.5GHz、峰值功率达15kW的脉冲激光输出。实验研究了不同重复频率时的输出激光脉冲特性。
Reported a narrow-linewidth, high-peak-power fiber laser based on the main oscillating power amplification (MOPA) mode of operation. The laser pulse-modulated distributed feedback single-frequency semiconductor laser as the seed source, a wavelength of 1064.12nm, a pulse width of 3.92ns, the repetition frequency of 10 ~ 50kHz continuously adjustable. A preamplifier stage of optical fiber double-pass amplification structure is adopted to increase the small signal amplification capability and suppress spontaneous emission under strong pumping. The length of the power amplification stage optical fiber is optimized to suppress stimulated Brillouin scattering during narrow linewidth laser amplification, At a repetition rate of 10 kHz, a pulsed laser output with a spectral linewidth of 1.5 GHz and a peak power of 15 kW was obtained. Experimental study of the output laser pulse characteristics of different repetition rates.