Liu Bowu, Sun Xibo, Wang Hui, Yuan Qiang, Tian Menjiya, Chu Dongya, Geng Yuanchao
Opt Express. 2024 Mar 25;32(7):11491-11508. doi: 10.1364/OE.517542.
In laser-driven inertial confinement fusion (ICF) facilities, nonuniform laser irradiation can cause significant challenges, such as hydrodynamics instability and laser plasma instability, which hinder the success of fusion. This article presents a new idea for improving the uniformity of far-field laser irradiation through a method of single-beam polarization smoothing. The method involves modulating full Poincaré beams using stress-engineered optics made from fused silica. We designed a stress birefringence system and conducted opto-mechanical modeling and analysis on it. The article elaborates on the mechanism and principles of generating large-aperture full Poincaré beams by stress birefringence, as well as the mechanism of polarization smoothing by full Poincaré beams. Near-field polarization measurements were conducted to verify these mechanisms, and the effectiveness of this method in improving the uniformity of laser irradiation in the target area was evaluated through far-field optical tests.
在激光驱动惯性约束聚变（ICF）设施中，激光辐照不均匀会引发重大挑战，如流体动力学不稳定性和激光等离子体不稳定性，这些都会阻碍聚变的成功。本文提出了一种通过单光束偏振平滑方法来提高远场激光辐照均匀性的新思路。该方法涉及使用由熔融石英制成的应力工程光学元件调制全庞加莱光束。我们设计了一个应力双折射系统，并对其进行了光机械建模与分析。文章详细阐述了通过应力双折射产生大孔径全庞加莱光束的机理和原理，以及全庞加莱光束的偏振平滑机理。进行了近场偏振测量以验证这些机理，并通过远场光学测试评估了该方法在提高靶区激光辐照均匀性方面的有效性。
