Author Affiliations
Abstract
Research Center of Laser Fusion of China Academy of Engineering Physics, 919-988 mail-box, Mianyang, SiChuan, 621900, PR China
In indirect drive, reducing peak intensity of a single beam and controlling overlap of multi-beams are two opposite requirements for laser focal spot design. In this paper, an improved laser spot design technique for indirect drive built upon the geometric structures of laser propagation into hohlraum has been introduced. The proposed technique is able to generate appropriate continuous phase plate (CPP) producing a special shaped spot that can balance the opposite requirements. The corresponding CPP does not bring difficulties to the design and fabrication. Phase aberrations are more sensitive to the special shaped spot; however, it can be tolerable for the current beam control level.
beam aberration CPP focal spot optimization ICF Laser systems High Power Laser Science and Engineering
2017, 5(3): 03000e20
中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
研究了光线追迹和随机相位滤波作为初始相位设计的连续相位板下, 光束畸变对连续相位板整形性能的影响。结果表明：随机相位滤波得到的连续相位板相比光线追迹获得的连续相位板, 在幅度畸变、离焦的容忍度等方面都有优越性;进一步分析了相位畸变、对准误差、口径误差等对连续相位板性能的影响, 确定了相位畸变是影响性能的首要因素, 并且大目标焦斑的畸变宽容度更大, 由此引入了波前的相对畸变因子, 在所定义的连续相位板性能标准下, 波前容忍度为0.5。
连续相位板 初始相位 光束畸变 焦斑整形 continuous phase plates initial phase beam aberration focal spot shaping
华侨大学信息科学与工程学院, 福建 泉州 362021
轴棱锥的斜入射和加工误差对产生零阶贝塞耳光的光束质量有很大影响,而轴棱锥的加工误差常常是轴棱锥圆形横截面被加工成椭圆。由衍射理论和几何光学方法出发,分析了圆轴棱锥的斜入射和椭圆轴棱锥的正入射对产生贝塞耳光束质量影响的等价性。根据理论计算, 模拟了圆轴棱锥的斜入射和椭圆轴棱锥加工误差的衍射光斑图。提出利用轴棱锥旋转法修正椭圆轴棱锥对无衍射贝塞耳光束质量的影响,获得了近似理想的贝塞耳光束,理论分析与模拟和实验结果基本相符。
激光光学 椭圆轴棱锥 光束畸变 贝塞耳光束
