Second-harmonic generation of spatiotemporal optical vortices and conservation of orbital angular momentum
S. W. Hancock, S. Zahedpour, H. M. Milchberg
Abstract
A spatiotemporal optical vortex (STOV) is an intrinsic optical orbital angular momentum (OAM) structure in which the OAM vector is orthogonal to the propagation direction [ Optica 6 , 1547 ( 2019 ) OPTIC8 2334-2536 10.1364/OPTICA.6.001547 ] and the optical phase circulates in space-time. Here, we experimentally and theoretically demonstrate the generation of the second harmonic of a STOV-carrying pulse along with the conservation of STOV-based OAM. Our experiments verify that photons can have intrinsic orbital angular momentum perpendicular to their propagation direction.
Topics & Concepts
Angular momentumOptical vortexPhysicsOrbital angular momentum of lightVortexPhotonOpticsPulse (music)Orbital angular momentum multiplexingPhase spaceSecond-harmonic generationHarmonicTotal angular momentum quantum numberClassical mechanicsLaserQuantum mechanicsMechanicsDetectorOrbital Angular Momentum in OpticsLaser-Matter Interactions and ApplicationsAdvanced Fiber Laser Technologies