Author Affiliations
Abstract
1 State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
The plasma mirror system was installed on the 1 PW laser beamline of Shanghai Superintense Ultrafast Laser Facility (SULF) for enhancing the temporal contrast of the laser pulse. About 2 orders of magnitude improvement on pulse contrast was measured on picosecond and nanosecond time scales. The experiments show that high-contrast laser pulses can significantly improve the cutoff energy and quantity of proton beams. Then different target distributions are assumed in particles in cell simulations, which can qualitatively assume the expansion of nanometer-scale foil. The high-contrast laser enables the SULF-1PW beamline to generally be of benefit for many potential applications.
ultraintense laser plasma mirror high-contrast laser proton acceleration Chinese Optics Letters
2023, 21(4): 043802
1 鲁东大学物理与光电工程学院, 山东 烟台 264025
2 鲁东大学交通学院, 山东 烟台 264025
提出了一种基于非正交二元相位板的阵列光镊系统,此系统可以实现对非正交排列的多个粒子的稳定捕获。通过对高数值孔径物镜在紧聚焦条件下的傅里叶变换理论和遗传算法来设计二元相位,优化得到具有不同分束比的,具有高衍射效率、高均匀度的归一化相位转折点,进而根据相位转折点设计出具有不同倾斜角度的非正交二元相位板。利用此二元相位板可以获得高数值孔径物镜聚焦下的各种非正交分布的阵列光斑。利用此类非正交阵列光斑,在光镊实验中实现了对二氧化硅微球的稳定捕获。理论模拟与实验结果表明,此方法可以实现对非正交排列的大量粒子的稳定捕获,在纳米粒子阵列的外延生长领域有着良好的应用前景。
激光器 激光捕获 二元相位板 非正交阵列 遗传算法
