时域-频域精密调控光纤激光脉冲产生系统

惯性约束聚变精密物理实验要求高功率激光驱动器具备时域-频域精密调控能力, 以实现对激光与等离子体相互作用过程中非线性效应的抑制。基于保偏光纤和单偏振光纤技术, 采用温度调谐双振荡器结合两级波导相位调制器实现激光脉冲频域精密调控, 采用两级高速电光调制脉冲整形技术实现激光脉冲时域精密调控, 将微波射频信号取样检测与声光开关进行连锁以确保整个系统的安全运行。实验获得了光谱带宽为0.15～0.3 nm、中心波长范围为1052.4～1053.6 nm的连续可调微焦耳级激光脉冲, 波长调谐精度为0.1 nm,在微焦级实现了对比度大于500∶1的高对比度整形激光脉冲, 脉冲时间波形顶部调制深度小于10%。

Abstract

In order to suppress the nonlinear effect caused by the interaction between laser and plasmas, precision physics experiments on inertial confinement fusion require a high power laser driver with the capability of fine adjusting in time-frequency domain. Based on technologies of polarization-maintaining fiber and single-polarization fiber, double oscillators with temperature tuning combined with two-class waveguide phase modulators are adopted to achieve the precise adjustment for laser pulse in frequency domain. Besides, the technology of two-class high speed electro-optic modulation pulse shaping is used to achieve laser pulse precision control in time domain. The sampling detection for microwave radio frequency signal is interlocked with the acoustic-optic switch to ensure the safe operation of the whole system. The continuous adjustable laser pulse in micro-joule level is experimentally obtained with bandwidth range of 0.15-0.3 nm, central wavelength range of 1052.4-1053.6 nm and wavelength tuning accuracy of 0.1 nm. The contrast ratio of shaping laser pulse is as far as 500∶1 in micro-joule level, and the modulation degree of pulse time waveform at top is lower than 10%.

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周丹丹, 许党朋, 田小程, 张锐, 宗兆玉, 范孟秋, 朱娜, 谢亮华, 李宏勋. 时域-频域精密调控光纤激光脉冲产生系统[J]. 中国激光, 2017, 44(6): 0606001. Zhou Dandan, Xu Dangpeng, Tian Xiaocheng, Zhang Rui, Zong Zhaoyu, Fan Mengqiu, Zhu Na, Xie Lianghua, Li Hongxun. Fine Adjusting Fiber Laser Pulse Generation System in Time-Frequency Domain[J]. Chinese Journal of Lasers, 2017, 44(6): 0606001.

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