摘要:
为满足惯性约束聚变（ICF）系统中,对焦斑均匀辐照的条件,研究了连续位相板（CPP）面形特征对远场光斑质量的影响.从波动光学和几何光学两个不同的角度建立分析模型,并利用均方根梯度这一参数将其统一起来.利用所建立的分析模型,通过数值计算研究了CPP面形均方根梯度对低频畸变光束的匀滑效果.结果表明：随着CPP均方根梯度增大,匀滑后的远场焦斑半径增大;光束顶部不均匀性先很快减小,再缓慢降低,最后趋于不变,可见CPP对光束的匀滑效果明显;束匀滑过程对能量利用率的影响先几乎不变,然后逐渐减小.当CPP的相关长度不变,均方根梯度在0.2—0.8wave/mm范围内时,光斑尺寸、光束顶部不均匀性及能量利用率都在较好的范围.
Abstract:
In order to satisfy uniform irradiation requirement in inertial confinement fusion（ICF） system,the influence of surface characteristics of continuous phase plate on beam quality is studied in this paper.Based on wave optics and geometrical optics,theoretical analysis model is established,respectively.And the parameter,root mean square gradient,is used to unify both theoretical models.Meanwhile,the smoothing effects of root mean square phase gradient of continuous phase plate on laser beam with low-frequency aberrant wavefront are simulated.Numerical simulations show that the radius of focus spot will increase with the increase of root mean square phase gradient of continuous phase plate,and nonuniformity of beam top will decrease quickly,then reduce slowly and tend to be unchanged finally.So smoothing effect of continuous phase plate is obvious.In addition,energy availability factor has little change,then decreases gradually and reduces slowly.Spot size,nonuniformity of beam top and energy availability factor are all in a good range when the correlation length of continuous phase plate is not changed and root mean square gradient is 0.2—0.8 wave/mm.
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