Solid State Institute and Physics Department, Technion-Israel Institute of Technology, Haifa 32000, Israel.
Opt Lett. 2013 Jan 15;38(2):223-5. doi: 10.1364/OL.38.000223.
We propose and numerically demonstrate a method for obtaining high-harmonic radiation with desirable elliptical polarization. Atoms are shined by a combination of a strong linearly-polarized laser field and an additional weak field, which is elliptically polarized in a plane perpendicular to the polarization direction of the strong field. The strong driver ionizes and recollides electrons with their parent ion, while the weak field perturbatively drives the electrons away from "head-on" collision. Upon recombination, new elliptically polarized harmonics with same ellipticity as the weak driver are emitted at efficiency which linearly depends on the intensity of the weak beam, but is independent of its elilipticity.
我们提出并数值演示了一种获得具有理想椭圆偏振的高次谐波辐射的方法。原子被一个强线偏振激光场和一个附加的弱场的组合照射，该弱场在垂直于强场偏振方向的平面内具有椭圆偏振。强驱动电离并使电子与它们的母离子重新碰撞，而弱场则微扰地将电子从“迎头”碰撞中驱离。在复合时，以与弱驱动相同的椭圆率发射出新的椭圆极化谐波，其效率与弱光束的强度呈线性关系，但与椭圆率无关。
