【摘要】 在惯性约束聚变(ICF)领域,采用自适应光学(AO)技术进行波前控制是解决ICF激光系统中光束质量问题的重要手段。报道了"神光Ⅲ"原型装置中8套工程化自适应光学系统、未来ICF系统发展所需的大口径可拆卸变形镜(DM)样镜研制以及ICF自适应光学波前控制技术的最新研究进展。8套工程化自适应光学系统在"神光Ⅲ"原型装置上实现了到靶点的全系统静态像差校正,改善了靶点焦斑能量分布,验证了校正对打靶时X射线分布的改善效果。所研制的17单元大口径可拆卸变形镜的口径为284 mm×284 mm,行程大于±6 μm,谐振频率大于500 Hz。在ICF自适应光学波前控制技术中,采用了基于哈特曼传感器近场相位测量的控制方法和基于靶室远场的随机并行梯度下降(SPGD)控制方法均能取得良好的校正性能。更多还原

【Abstract】 Adaptive optical wavefront control technique is an important means to improve the beam quality in the inertial confinement fusion (ICF) laser system. The new progress on adptive optics (AO) in ICF facility, including the 8 sets of AO systems for the "Shenguang Ⅲ" prototype facility, the development of the large aperture deformable mirror (DM) prototype with the replaceable actuators used in the future ICF systems, and the AO wavefront control technologies, are introduced. In the "Shenguang Ⅲ" prototype facility, the static aberrations of the entire optical system from the front-end to the target using the 8 sets of AO systems are successfully corrected and the focal spot intensity distributions in the target are improved. The improvement of the X-ray distributions after AO correction is observed. A large aperture DM prototype with 17 replaceable actuators, 284 mmX284 mm aperture size, more than ±6 μm stroke and 500 Hz resonant frequency is manufactured and tested. The stochastic parallel gradient descent (SPGD) algorithm based on the far-field focal spot intensity is tested and proven to be effective for the ICF facility.更多还原