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对激光惯性约束聚变(ICF)驱动器终端光学系统中连续相位板(CPP)的位置优化进行了研究.根据高强度激光非线性及微扰传输理论计算了CPP前置时激光通过频率转换系统以后的近远场光束特性和系统的三倍频转换效率.研究发现,前置于基频光路的CPP对三倍频转换效率和出射光束特性均有影响,但只要远场圆形焦斑直径小于0.5mm,三倍频转换效率的下降与出射光束通量对比度的上升均在容许范围之内,同时远场焦斑形态和能量集中度也符合设计要求.对于实现远场小焦斑匀滑的CPP前置于ICF的基频光路中进行光束匀滑和整形,不会对ICF系统的正常运行产生影响.
The position optimization of continuous phase plate (CPP) in laser inertial confinement fusion (ICF) driver terminal optical system was studied.According to the theory of high intensity laser nonlinearity and perturbation transmission, The far-field beam characteristics and the system's triple-frequency conversion efficiency were studied.It was found that the CPP placed on the fundamental optical path had an effect on the conversion efficiency of the triplet frequency and the characteristics of the outgoing beam, but as long as the diameter of the far-field circular focal spot was less than 0.5 mm, the decrease of the third harmonic conversion efficiency and the rise of the outgoing beam flux contrast are within the allowable range, and the shape and energy concentration of the far field focal spot also meet the design requirements. Pre-placed in the ICF's fundamental optical path for beam smoothing and shaping, will not affect the normal operation of the ICF system.