1 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Department of Physics, Shanghai Normal University, Shanghai 200234, China
The interference of a relativistic vortex laser is investigated for the case when a linearly polarized Laguerre-Gaussian pulse impinges on a double-slit solid target. Three-dimensional particle-in-cell simulation results show that the interference fringes of high-order harmonics are twisted, similar to that of the fundamental vortex laser. The twisting order of the interference pattern is determined by the order of the vortex high-order harmonics, which can be explained by the classic double-slit interference models. The usual double-slit interference has been extended to the regime of relativistic intensity, which may have potential applications for measuring the topological charge of vortex high-order harmonics.
Project supported by the National Natural Science Foundation of China (Grant Nos. 11335013, 11575274, 11674339, and 61805266), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB16), the Ministry of Science and Technology of the People's Republic of China (Grant Nos. 2016YFA0401102 and 2018YFA0404803), and the Innovation Program of the Shanghai Municipal Education Commission, China (Grant No. 201701070002E00032).
Hao Zhang(张浩), Bai-Fei Shen(沈百飞), Lin-Gang Zhang(张林港) Double-slit interference of a relativistic vortex laser 2019 Chin. Phys. B 28 014702
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