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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0.15~0.3nm、中心波长范围为1052.4~1053.6nm的连续可调微焦耳级激光脉冲,波长调谐精度为0.1nm,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%。
Inertial confinement fusion precision physics experiments require high-power laser driver with time-frequency precision control ability in order to achieve the laser and plasma interaction nonlinear process inhibition. Based on polarization-maintaining fiber and single polarization fiber technology, temperature-tuned double oscillator and two-stage waveguide phase modulator are used to realize precise control of laser pulse frequency domain. Two-stage high-speed electro-optical modulation pulse shaping technology is used to realize precise control of laser pulse time domain. RF signal sampling detection and sound and light switch chain to ensure the safe operation of the entire system. The experimentally obtained continuously adjustable micro-Joule-level laser pulses with a spectral bandwidth of 0.15-0.3 nm and a central wavelength range of 1052.4-105.6 nm with wavelength tuning accuracy of 0.1 nm and high contrast with a contrast ratio greater than 500 ... 1 at the micro-focal level Shaping laser pulse, the top of the pulse time waveform modulation depth is less than 10%.