Interferometric adaptive optics for high-power laser pointing and wavefront control and phasing
Interferometric adaptive optics for high-power laser pointing and wavefront control and phasing
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DOI：
10.1117/1.3167840
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发表时间：
2009-07
影响因子：
2
通讯作者：
K. Baker;E. Stappaerts;D. Homoelle;M. Henesian;E. Bliss;C. Siders;C. Barty
中科院分区：
文献类型：
--
作者：
K. Baker;E. Stappaerts;D. Homoelle;M. Henesian;E. Bliss;C. Siders;C. Barty
实施快速点火实验的能力，以及在国家点火设施（NIF）上进行的射线照相实验，对每个光束的指向和整体波前质量的控制提出了严格的要求。这些实验将使用四个NIF光束，即四个光束对，流体动力学和粒子模拟表明，对于快速点火实验，这些光束将需要在快速点火锥靶末端直径为40 μ m的光斑内提供其总能量（7.96 kJ）的50%（4.0 kJ）。该要求意味着用于校正这些光束线的自适应光学系统上的严格的指向和总体相位共轭误差预算。通过成对光束的定相，更容易满足总环绕能量要求，但仍然需要高斯特列尔比和约1 µrad的均方根倾斜/倾斜误差。为了完成这项任务，我们设计了一个干涉自适应光学系统，能够光束指向，高斯特列尔比，光束定相与一个单一的像素化微机电系统变形镜和干涉波前传感器。我们提出了一个测试平台的设计，用于评估这种波前传感器的性能，沿着与模拟其预期的性能水平。
Implementing the capability to perform fast ignition experiments, as well as, radiography experiments on the National Ignition Facility (NIF) places stringent requirements on the control of each of the beam's pointing and overall wavefront quality. One quad of the NIF beams, four beam pairs, will be utilized for these experiments and hydrodynamic and particle-in-cell simulations indicate that for the fast ignition experiments, these beams will be required to deliver 50% (4.0 kJ) of their total energy (7.96 kJ) within a 40-µm-diam spot at the end of a fast ignition cone target. This requirement implies a stringent pointing and overall phase conjugation error budget on the adaptive optics system used to correct these beam lines. The overall encircled energy requirement is more readily met by phasing of the beams in pairs but still requires high Strehl ratios and root-mean-square tip/tilt errors of approximately 1 µrad. To accomplish this task we have designed an interferometric adaptive optics system capable of beam pointing, high Strehl ratio, and beam phasing with a single pixilated microelectromechanical systems deformable mirror and interferometric wavefront sensor. We present the design of a testbed used to evaluate the performance of this wavefront sensor along with simulations of its expected performance level.