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光纤技术为惯性约束聚变激光驱动器前端系统提供了许多便利,如便于分路、鲁棒性和稳定性。提出了一套全光纤前端的方案来适应未来高能拍瓦激光装置对种子源的需求。实验研究了这套用于产生高能短脉冲激光的光纤前端系统的啁啾脉冲展宽与放大特性。采用锁模振荡器的相位锁定信号作为系统的参考时钟,将各级光开关器件进行同步。系统采用波导幅度调制器来选取需要的信号重复频率,并用声光调制器(AOM)对放大器级间放大自发辐射(ASE)光进行抑制。通过大模场光纤放大器后系统输出啁啾脉冲峰值功率4.1 kW,脉宽760 ps,输出脉冲稳定。鲁棒性、高可靠性和使用便捷的优点使这套前端系统为高能拍瓦激光装置提供了一种可选择的种子脉冲产生方式。
Fiber technology offers a host of conveniences for inertial confinement fusion laser driver front-end systems such as shunting, robustness and stability. A set of all-fiber front-end solution is proposed to meet the needs of seed sources for high-energy shoot-wattage laser devices in the future. The chirped pulse broadening and amplifying characteristics of the fiber front-end system for generating high-energy short-pulse laser were experimentally studied. The phase locked signal of the mode-locked oscillator is used as the system reference clock to synchronize the optical switching devices at all levels. The system uses a waveguide amplitude modulator to select the desired signal repetition frequency and suppress the amplification of spontaneous emission (ASE) light at the amplifier stage with an acousto-optic modulator (AOM). After passing through the large mode fiber amplifier, the system outputs chirped pulse peak power of 4.1 kW and pulse width of 760 ps, and the output pulse is stable. The robustness, reliability and ease-of-use make this front-end system an alternative seed-pulse generator for high-energy-watt lasers.