The conservation of the spatiotemporal orbital angular momentum of light
ORAL
Abstract
Spatiotemporal orbital angular momentum (ST-OAM) of light processes transverse OAM that is different from conventional OAM of light with longitudinal OAM. A pulsed beam carrying ST-OAM has a localized electromagnetic field vortex that shows spiral phase winding structure in both space and time. In our experiment, we uncovered the conservation of transverse OAM in a second-harmonic generation process, where the spatiotemporal topological charge of the fundamental field is doubled along with the optical frequency. We also observed that the topology of a second-harmonic ST-OAM field could be altered by complex spatiotemporal astigmatism, leading to multiple phase singularities separated in space and time.
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Publication: G. Gui et al. "Second-harmonic generation and the conservation of spatiotemporal orbital angular momentum of light," 10 December 2020, PREPRINT (Version 1) available at Research Square [https://doi.org/10.21203/rs.3.rs-116263/v1]
Presenters
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Chen-Ting Liao
JILA, University of Colorado, Boulder
Authors
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Chen-Ting Liao
JILA, University of Colorado, Boulder
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Guan Gui
JILA, University of Colorado, Boulder
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Nathan Brooks
JILA, University of Colorado, Boulder
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Henry C Kapteyn
JILA, University of Colorado, Boulder
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Margaret M Murnane
JILA, University of Colorado, Boulder