Ultra-intense vortex laser generation from a seed laser illuminated axial line-focused spiral zone plate
Ultra-intense vortex laser generation from a seed laser illuminated axial line-focused spiral zone plate
复制标题
从种子激光照射轴线聚焦螺旋波带板产生超强涡旋激光
DOI：
10.1364/oe.467926
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发表时间：
2022
期刊：
影响因子：
3.8
通讯作者：
Tong-Pu Yu
中科院分区：
文献类型：
--
作者：
Hao Zhang;Qianni Li;Chenglong Zheng;Jie Zhao;Yu Lu;Dongao Li;Xinrong Xu;Ke Liu;Ye Tian;Yuliang Lin;Fangpei Zhang;Tong-Pu Yu
相对论涡旋激光器由于其在激光等离子体领域的潜在应用，产生具有轨道角动量（OAM）的高能带电粒子、高OAM X/ γ射线发射、高谐波产生和强轴向磁场产生。然而，这种相对论涡旋激光的产生对目前的激光技术仍然是一个挑战。利用轴向线聚焦螺旋波带片（ALFSZP）微结构靶，提出了一种产生超强涡旋激光的新方案。在该方案中，相对论高斯激光脉冲照射ALFSZP，并在通过ALFSZP时发生衍射。由于ALFSZP的聚焦和径向希尔伯特变换能力，种子激光被有效地转换为涡旋激光，然后在可调聚焦体积中良好聚焦。三维粒子模拟结果表明，采用强度为1.3 × 1020 W/cm 2的种子激光脉冲，获得的涡旋激光强度高达1.3 × 1021 W/cm 2，每光子平均角动量高达0.73 μ m，具有广阔的应用前景.
Relativistic vortex laser has drawn increasing attention in the laser-plasma community owing to its potential applications in various domains, e.g., generation of energetic charged particles with orbital angular momentum (OAM), high OAM X/ γ -ray emission, high harmonics generation, and strong axial magnetic-field production. However, the generation of such relativistic vortex laser is still a challenge to the current laser technology. Using micro-structure targets named axial line-focused spiral zone plate (ALFSZP), we propose a novel scheme for ultra-intense vortex laser generation. In the scheme, a relativistic Gaussian laser pulse irradiates an ALFSZP, and diffracts as it passes through the ALFSZP. Due to the focusing and radial Hilbert transform capabilities of the ALFSZP, the seed laser is converted efficiently to a vortex one which is then well focused in a tunable focal volume. Three-dimensional particle-in-cell simulations indicate that using a seed laser pulse with intensity of 1.3 × 10 20 W/cm 2 , the vortex laser intensity achieved is as high as 1.3 × 10 21 W/cm 2 with the averaged angular momentum per photon up to 0.73 ℏ , promising diverse applications in various fields aforementioned.