Opt Lett. 2014 Jan 15;39(2):236-9. doi: 10.1364/OL.39.000236.
Burst-mode laser systems offer increased effectiveness in material processing while requiring lower individual pulse energies. Fiber amplifiers operating in this regime generate low powers in the order of 1 W. We present a Yb-doped fiber amplifier, utilizing doping management, that scales the average power up to 100 W. The laser system produces bursts at 1 MHz, where each burst comprises 10 pulses with 10 μJ energy per pulse and is separated in time by 10 ns. The high-burst repetition rate allows substantial simplification of the setup over previous demonstrations of burst-mode operation in fiber lasers. The total energy in each burst is 100 μJ and the average power achieved within the burst is 1 kW. The pulse evolution in the final stage of amplification is initiated as self-similar amplification, which is quickly altered as the pulse spectrum exceeds the gain bandwidth. By prechirping the pulses launched into the amplifier, 17 ps long pulses are generated without using external pulse compression. The peak power of the pulses is ∼0.6 MW.
突发模式激光系统在提高材料加工效率的同时，所需的单个脉冲能量较低。在这种模式下工作的光纤放大器产生的功率较低，约为 1 W。我们提出了一种利用掺杂管理的掺镱光纤放大器，可将平均功率提高到 100 W。该激光系统以 1 MHz 的频率产生突发脉冲，每个突发脉冲包含 10 个脉冲，每个脉冲的能量为 10 μJ，脉冲之间的时间间隔为 10 ns。高突发重复率使得与之前光纤激光器中突发模式运行的演示相比，系统设置大大简化。每个突发脉冲的总能量为 100 μJ，突发期间实现的平均功率为 1 kW。在放大的最后阶段，脉冲的演化是自相似放大，随着脉冲光谱超过增益带宽，这种放大很快就会改变。通过预啁啾注入放大器的脉冲，可以在不使用外部脉冲压缩的情况下产生 17 ps 长的脉冲。脉冲的峰值功率约为 0.6 MW。
