用于神光Ⅲ原型装置精密物理实验的时标激光系统

Laser time fiducial for precise physical experiment in Shenguang-Ⅲ prototype facility

用与大型激光装置输出主激光脉冲同步的梳状脉冲作为时间标尺,标定强激光与靶丸作用的过程,对强场物理实验测量及模拟实现精密化具有重要的意义.报道了一种电光调制结合光学方法产生与主激光精确同步的多频率时标激光脉冲的光纤系统.采用电光调制产生150ps快光脉冲,通过光纤堆积产生1053nm的基频梳状脉冲信号,经过放大和倍频输出527和351nm的绿光及紫外倍频梳状脉冲激光.系统可稳定地为神光Ⅲ原型装置提供精密物理实验所必需的各种频率的时标激光,并且可根据物理实验需要灵活地调整梳状脉冲间隔和幅度,具有很好的适应性.

Using comb laser pulses synchronized with the main pulse output by large laser facility as time fiducial to scale the reaction process between high power laser pulse and target is very important for the realization of precise measurement and simulation in the intense field experiment. We demonstrate a fiber multiharmonic time fiducial laser pulse generation system using optic-electric modulation and optical pulse stacking. A unit optical pulse with a width of 150 ps generated by modulation was stacked in a fiber stacker to form a 1053 nm comb pulse. The pulse was then amplified and frequency-converted to generate green （ 527 nm ） and UV （ 351 nm ） fiducials. The system can stably provide Shenguang-Ⅲ prototype facility with multi-frequency laser time fiducials which is essential for the precise physical experiment. In addition,the system is highly adaptive since it can generate fiducial signals with variable pulse intervals and amplitudes flexibly according to the requirements of different physical experiments.