Chinese Optics Letters, 2019, 17 (5): 050501, Published Online: May. 13, 2019
Diffraction of relativistic vortex harmonics with fractional average orbital angular momentum Download: 1238次
Abstract
Vortex harmonics with fractional average orbital angular momentum are generated when a relativistic fractional vortex beam is incident on and reflected from an over-dense plane plasma target. A two-step model is presented to explain the far-field patterns of the harmonics. In the first step, a fundamental spot-shaped hole is produced during the hole-boring stage, and harmonics are generated simultaneously. In the second step, different order harmonics are diffracted by the hole and propagate to the far field. This process can be accurately described by the Fraunhofer diffraction theory. This work facilitates a basic recognition of fractional vortex beams.
Shasha Li, Baifei Shen, Wenpeng Wang, Zhigang Bu, Hao Zhang, Hui Zhang, Shuhua Zhai. Diffraction of relativistic vortex harmonics with fractional average orbital angular momentum[J]. Chinese Optics Letters, 2019, 17(5): 050501.