State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
Sci Rep. 2023 Jan 2;13(1):55. doi: 10.1038/s41598-022-27148-0.
In this study, we numerically simulate the evolution of the orbital angular momentum (OAM) spectrum of a vortex laser beam in the optical parametric chirped pulse amplification (OPCPA) process, which is an effective technical method to realize ultra-intense and ultra-short vortex laser amplification. The results show that the proportion of the vortex laser beam with 100% topological charge (TC) of 1 decreases to 97.44% with the enhancement of the saturation amplification after amplification by a 15 mm length LBO pumped by a 526.5 nm laser with a pump intensity of 1.74 GW/cm. Conversely, the beams with other topological charges generate and increase with the amplification. The simulation results are consistent with our previous experimental results. Meanwhile, compared with non-collinear OPCPA, collinear OPCPA can maintain well the proportion of TC [Formula: see text].
在这项研究中，我们对光学参量啁啾脉冲放大（OPCPA）过程中涡旋激光光束轨道角动量（OAM）谱的演化进行了数值模拟，这是实现超强度和超短涡旋激光放大的有效技术方法。结果表明，在 1.74GW/cm 的泵浦强度下，用 526.5nm 激光泵浦 15mm 长的 LBO 放大后，具有 100%拓扑电荷（TC）的 1 的涡旋激光光束的比例从 97.44%降低到 97.44%。相反，具有其他拓扑电荷的光束会随着放大而产生和增加。模拟结果与我们之前的实验结果一致。同时，与非共线 OPCPA 相比，共线 OPCPA 可以很好地保持 TC 的比例。
