Vortex Harmonic Generation by Circularly Polarized Gaussian Beam Interacting with Tilted Target,Physical Review Applied

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Vortex Harmonic Generation by Circularly Polarized Gaussian Beam Interacting with Tilted Target
Physical Review Applied ( IF 3.8 ) Pub Date : 2021-07-28 , DOI: 10.1103/physrevapplied.16.014065
Lingang Zhang ₁ , Baifei Shen _{1,

2} , Zhigang Bu ₁ , Xiaomei Zhang ₂ , Liangliang Ji ₁ , Shan Huang _{1,

3} , M. Xiriai ₂ , Zhangli Xu _{1,

3} , Chen Liu ₄ , Zhizhan Xu ₁

Affiliation

When a circularly polarized (CP) Gaussian beam normally irradiates a solid plasma target, the spin angular momentum of the CP beam transforms into the orbital angular momentum (OAM) of the high-order harmonics through the spin-orbital interaction; this provides a promising way to obtain intense attosecond pulses carrying OAM. However, normal irradiation faces realistic challenges in experiments, as one cannot extract the harmonic without interfering with the driving laser. Here, we propose a feasible scheme to generate vortex high-order harmonics by using a CP Gaussian beam obliquely incident to the target. Theoretical analyses and simulation results show that the

n th

-order harmonic is composed of vortex modes with topological charges from

l = 0

| l | = n - 1

. The composition ratio depends on the laser focal size and the incident angle. The obtained number of vortex photons is comparable to the normal incidence case at up to an incident angle of

10^{\circ}

, which greatly facilitates the experimental arrangement.

中文翻译：

圆偏振高斯光束与倾斜目标相互作用产生的涡谐波

当圆极化（CP）高斯光束正常照射固体等离子体目标时，CP光束的自旋角动量通过自旋轨道相互作用转化为高次谐波的轨道角动量（OAM）；这为获得携带 OAM 的强阿秒脉冲提供了一种很有前景的方法。然而，正常照射在实验中面临现实挑战，因为不能在不干扰驱动激光器的情况下提取谐波。在这里，我们提出了一种可行的方案，通过使用斜入射到目标的 CP 高斯光束来产生涡旋高次谐波。理论分析和仿真结果表明