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I will start with a brief introduction to the strong-field optics - a field that packed with nonlinearity and extreme physics. Then I will proceed with my recent work on high-harmonics generation (HHG) and spin-orbit interaction of light in the diffraction at relativistic intensities. When a high power laser beam irradiates a small aperture on a solid foil target, the strong laser field drives surface plasma oscillation at the periphery of this aperture, which acts as a “relativistic oscillating window.” The diffracted light that travels though such an aperture contains high-harmonics of the fundamental laser frequency. When the driving laser beam is circularly polarized, the HHG process facilitates a conversion of the spin angular momentum of the fundamental light into the intrinsic orbital angular momentum of the harmonics.
Prof. Longqing Yi has just joined Tsung-Dao Lee Institute, Shanghai Jiao Tong University as a T. D. Lee Fellow. He obtained his Ph.D in 2014 from Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences. He then worked as a postdoc in Heinrich-Heine University Duesseldorf in 2015-2016, and in Chalmers University of Technology in 2017-2021. He works on advanced particle accelerators and light sources based on relativistic laser-plasma interactions, strong-field optics, and laboratory astrophysics.