Hernández-García, C., Picón, A., San Román, J. Second-harmonic generation and the conservation of orbital angular momentum with high-order Laguerre–Gaussian modes. Second-harmonic generation and the orbital angular momentum of light. Generation of spatiotemporal optical vortices with controllable transverse orbital angular momentum. Free-space propagation of spatiotemporal optical vortices. Spatiotemporal vortex beams and angular momentum. Spatio-temporal vortices: properties, generation and recording. Generation of extreme-ultraviolet beams with time-varying orbital angular momentum. Coherent Fourier scatterometry using orbital angular momentum beams for defect detection. Concentration of higher dimensional entanglement: qutrits of photon orbital angular momentum. Transverse and longitudinal angular momenta of light. Orbital angular momentum of light and the transformation of Laguerre–Gaussian laser modes. Our study opens a new route for nonlinear conversion and scaling of light carrying ST-OAM, with the potential for driving other secondary ST-OAM sources of electromagnetic fields and beyond.Ĭoullet, P., GIL, L. Furthermore, we observe that the topology of a second-harmonic ST-OAM pulse can be modified by complex spatiotemporal astigmatism, giving rise to multiple phase singularities separated in space and time. Our experiment thus suggests a general ST-OAM nonlinear scaling rule, analogous to that in conventional OAM of light. We uncover the conservation of transverse OAM in a second-harmonic generation process, where the space–time topological charge of the fundamental field is doubled along with the optical frequency. Here, we present the generation and characterization of the second harmonic of ST-OAM pulses.
This field carries characteristic space–time spiral phase structure and transverse intrinsic OAM. Light with spatiotemporal orbital angular momentum (ST-OAM) is a recently discovered type of structured and localized electromagnetic field.