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采用光谱色散平滑和连续相位板实现靶面均匀辐照的实验研究
Experimental research of target uniform illumination using smoothing by spectral dispersion and continuous phase plate
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摘要: 为了改善高功率激光装置的靶面辐照均匀性,在神光-Ⅲ原型装置的一路光上开展了结合光谱色散平滑（SSD）和连续相位板（CPP）的高通量实验研究.实验基于调制频率9.2 GHz的体相位调制器开展,输出的相位调制脉冲光谱展宽稳定,脉冲波形顶部剩余调制很小.结果表明SSD色循环数为1时预放和主放各级空间滤波器过孔顺利,包含焦斑95%能量的通量对比度由窄带时的1.71下降到加SSD和CPP时的0.47.三倍频光脉宽1 ns,能量1115 J时,CPP和终端光学组件元件未见损伤.通过实验解决了在高功率激光装置上采用SSD和CPP进行靶面均匀辐照的若干关键技术,为将其应用于物理实验奠定了坚实基础.Abstract: To improve laser irradiation uniformity, experimental research on smoothing by spectral dispersion （SSD） and continuous phase plate （CPP） is carried out on the technical integration line （TIL）. A bulk phase modulator with 9.2 GHz modulation frequency is adopted. The output spectrum of the phase modulator is stable and the residual amplitude modulation is quite small. The experimental results indicate that when the number of color cycles （No） is adopted to be 1, imposing of SSD in this divergence does not lead to pinhole closure in the spatial filters of the preamplifier and main amplifier. The contrast of the focal spot with 95% energy included with SSD and CPP drops to 0.47 compared with 1.71 without SSD and CPP. When the pulse width of the third harmonic wave is 1 ns and its energy is 1115 J, no damage is found in CPP and other final optics. The experiment solves some key techniques by using SSD and CPP on high-power laser facilities, and provides sound basis for the upcoming physics experiment.
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