增益调制高重频脉冲光纤激光器实验研究

采用脉冲泵浦方案,研制出了基于增益调制技术的全光纤结构高重频脉冲激光器。采用电路直接调制的激光二极管作为泵浦源,双包层光纤作为增益介质,构造了光纤光栅选模的线形腔结构。实验中通过调整泵浦光脉冲宽度和光纤激光器谐振腔长度,得到了稳定的高重频脉冲。在100kHz重复频率下,采用21W的峰值泵浦功率和2.5μs的泵浦脉冲宽度,获得了1.06μm波长,脉冲宽度247ns的稳定脉冲激光输出。脉冲峰值功率一致性好,平均功率长期功率稳定性为2%。观察并分析了由于纵模拍频在脉冲包络上产生的次脉冲特性。通过一级放大实现89.6 W输出。

Experimental study of gain-switched high repetition rate pulse fiber laser

A gain-switched high repetition rate pulse all fiber laser pumped by pulsed laser diode is developed. The linear cavity laser with fiber Bragg grating was designed in which directly modulated laser diode was used as the pump source, the double cladding fiber was the gain medium. Stable laser pulse trains were obtained by testing different peak pump power and the cavity length. Under peak pump power of 21 W and pulse duration of 2.5 s at repetition rate of 100 kHz, stable laser pulse trains were obtained at 1.06 m with pulse duration of 247 ns. The values of laser pulse peak power have good consistency, and the long term average power stability is proved to be less than 2%. The sub-pulses on top of the envelope caused by longitudinal mode beating were observed and analyzed. The output power of single stage amplifier is 89.6 W.