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Graduate Student Seminar - 02/14/2020

"Free-space propagation of spatiotemporal optical vortices"

by Scott Hancock

Advisor:  Professor Howard Milchberg

Friday, February 14, 2020 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Abstract: Spatiotemporal optical vortices (STOVs) are a new type of optical orbital angular momentum (OAM) with optical phase circulation in space-time. In prior work [Phys. Rev. X. 6, 031037 (2016)], we demonstrated that a STOV is a universal structure emerging from the arrest of self-focusing collapse leading to nonlinear self-guiding in material media. Here, we demonstrate linear generation and propagation in free space of STOV-carrying pulses. Our measurements and simulations demonstrate STOV mediation of space-time energy flow within the pulse and conservation of OAM in space-time. Single-shot amplitude and phase images of STOVs are taken using a new diagnostic, transient grating single-shot supercontinuum spectral interferometry.

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