Speaker
Description
Light can have spin angular momentum (SAM) and orbital angular momentum (OAM). While spin angular momentum is related to circular polarization and can only be either ℏ or −ℏ, OAM is related to the vortex phase structure and is equal to lℏ where l is the number of screw dislocations in the phase profile (or topological charge). In paraxial wave optics these two physical properties are regarded as independent. In this work, we show that is possible to combine these two quantities in the nonlinear regime. We exploit the non-collinear configuration of a type-II second harmonic generation to analyze all possible outputs of this process. We show that the generated beam has OAM equal to the sum of inputs OAM and SAM. This work unveils a novel type of interaction of degrees of freedom of light and we hope it can inspire discoveries of new types of light-matter interaction.
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