首页|Sequential harmonic spin-orbit angular momentum generation in nonlinear optical crystals
Sequential harmonic spin-orbit angular momentum generation in nonlinear optical crystals
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Light beams carrying multiple orbital angular momentum(OAM)states,which can be realized by the structured media with phase singularities,have attracted great attentions in the fields of high dimensional optical information processing.Alternatively,a simple uniaxial crystal can be used to simultaneously generate four OAM states of light through the sec-ond harmonic generation and cascaded optical spin-orbit interaction(SOI)processes.However,two of the OAM states realized in the crystal are very weak and limit the practical applications.Here,we aim to circumvent this constraint by us-ing the sequential optical SOI processes in two crystals with threefold rotational symmetry.Four angular momentum states of the fundamental waves are prepared after the first crystal and then are utilized to generate the corresponding second harmonic waves(SHWs)with opposite spin and doubled OAM in the second crystal.Further through a sequen-tial SOI process,totally eight angular momentum states of the SHWs with nearly equal energy are experimentally ob-served.The proposed methodology may find potential applications in optical communications,parallel optical computing,optical manipulation and so on.
angular momentum of lightnonlinear opticssecond harmonic generationoptical spin-orbit interaction
Yutao Tang、Zixian Hu、Junhong Deng、Kingfai Li、Guixin Li
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Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China
Institute for Applied Optics and Precision Engineering,Southern University of Science and Technology,Shenzhen 518055,China
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