Zhong Zheqiang, Hou Pengcheng, Zhang Bin
Opt Lett. 2015 Dec 15;40(24):5850-3. doi: 10.1364/OL.40.005850.
Laser-beam irradiation uniformity is a key issue in inertial confinement fusion research. We propose a radial smoothing (RS) approach in which the speckle in a focal plane is smoothed by the radial redistribution through fast focal zooming. This focal zooming is generated by introducing the periodical spherical wavefront modulation to the laser beam, based on an optical Kerr medium and its pump laser with the temporal profile of a Gaussian pulse train. The utilization of RS significantly improves the laser-beam uniformity without obvious impact on the performance of the high-power laser system.
激光束辐照均匀性是惯性约束聚变研究中的一个关键问题。我们提出了一种径向平滑（RS）方法，其中焦平面上的散斑通过快速焦距缩放的径向重新分布来平滑。这种焦距缩放是通过基于光学克尔介质及其具有高斯脉冲序列时间轮廓的泵浦激光，对激光束引入周期性球面波前调制来产生的。径向平滑的应用显著提高了激光束的均匀性，而对高功率激光系统的性能没有明显影响。
