Spin to orbital angular momentum transfer in frequency up-conversion

Abstract We demonstrate the spin to orbital angular momentum transfer in frequency upconversion with structured light beams. A vector vortex is coupled a circularly polarized Gaussian beam noncollinear second harmonic generation under type-II phase match. The inherits Hermite–Gaussian components of vortex; however, relative between them determined by polarization state beam. This effect creates an interesting crosstalk and degrees freedom, allowing them. Our experimental results match theoretical predictions for nonlinear optical response.