反高斯非均匀偏振激光器的研究

This research focuses on utilizing scalar and vector diffraction optical elements to bound the intracavitary electromagnetic field eigenstate, in order to abtain the rotationally symmetric hollow beam with high efficiency, high polarization purity, high intensity gradient,and bigger dark spot. Traditonal theory and analysis method of laser cavity are innovatively improved by constructing and resolving self-reproducing integral equation of eigen modes in laser cavity cotaining scalar and vector diffraction optical elements, and carrying out experimental research on continuous wave(CW), tunable and high energy Q-switch rotationally symmetric polarized hollow beam laser. Meanwhile, we will study the.focusing characterization of rotationally symmetric polarized hollow beam laser and the generation of longitudinally polarized beam. Furthermore, the research on non-paraxial propagation characteristics of rotationally symmetric polarized hollow beam in free space will also be done. The innovative research on rotationally symmetric polarized hollow beam laser and the corresponding innovative laser technology will have great impact on the development of cross-discipline of laser physics and diffraction optics, which will lay a strong foundation and provide relative scientific references for the research on the new optical effects and optical phenomena resulted from adjusting and controlling the hollow beam with spatial asymmetric polarization state. Rotationally symmetric polarized hollow beam has a very promising future in optical trapping, optical information processing, particle confinement, optical controlling of microscopic particle, material processing, etc.

本研究针对传统激光谐振腔的理论和分析方法进行创新性改进，着眼于利用标量衍射和矢量衍射分别约束激光谐振腔内电磁场的强度分布和偏振状态，通过建立和求解反高斯强度分布非均匀偏振激光谐振腔的自洽场方程，形成新的激光物理模型，进而完善激光器的谐振腔理论。同时，开展连续波、可调谐和高能调Q反高斯强度分布非均匀偏振激光器的实验研究，以及开展反高斯强度分布非均匀偏振激光束矢量聚焦特性以及产生纵波激光的研究，并且研究反高斯强度分布非均匀偏振激光束在自由空间和湍流大气中非近轴情况下的传播规律。反高斯强度分布非均匀偏振激光器的理论研究及新技术的开辟对激光物理与衍射光学交叉学科的发展有巨大的推动作用，也为调控空间非均匀偏振态所产生新的光学效应和新的光学现象奠定坚实的基础和提供相关的科学依据。此外，由于反高斯激光中心光强为零，在光学捕获、光学信息处理、粒子囚禁、微观粒子的光学操纵及材料加工等领域具有重要应用前景。

本项目利用标量衍射光学元件和矢量衍射光学元件分别约束激光谐振腔内电磁场的强度分布和偏振状态，通过建立和求解反高斯强度分布非均匀偏振激光谐振腔的自洽场方程，获得了一种全新的激光物理模型，从而完善了传统激光器的谐振腔理论。同时，开展了连续波、可调谐和高能调Q反高斯强度分布非均匀偏振激光器的实验研究，以及进行了反高斯强度分布非均匀偏振激光束矢量聚焦特性以及产生纵波激光的数值模拟，并且研究了反高斯强度分布非均匀偏振激光束在自由空间和湍流大气中非近轴情况下的传播规律。反高斯非均匀偏振激光器在光学捕获、光学信息处理、粒子囚禁、微观粒子的光学操纵及材料加工等领域具有重要应用前景。通过本项目的研究，我们在Optics Letters等学术期刊上发表了SCI论文11篇，授权国家发明专利10项，培养5名博士生，8名硕士生。