Second harmonic generation of spatiotemporal optical vortices and conservation of orbital angular momentum

2020/12/19 by Hancock, S. W., Zahedpour, S., Milchberg, H. M. · 3 citations
#FOS: Physical sciences #Optics (physics.optics)

paper · doi:10.48550/arxiv.2012.10806

Abstract

Spatiotemporal optical vortices (STOVs) are a new type of intrinsic optical orbital angular momentum (OAM) structure in which the OAM vector is orthogonal to the propagation direction [Optica 6, 1547, (2019)] and the optical phase circulates in space-time. Here, we experimentally and theoretically demonstrate, for the first time, the generation of the second harmonic of a STOV-carrying pulse along with the conservation of STOV-based OAM. Our experiments verify that individual photons can have intrinsic orbital angular momentum perpendicular to their propagation direction.

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• Mesh of Spatiotemporal Optical Vortices with Programmable Intensity Nulls
• Structuring Polarization States of Light in Space and Time
• Cascaded frequency conversion of highly charged femtosecond spatiotemporal optical vortices

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