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Spatiotemporal Optical Vortices
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DOI：10.1103/PhysRevX.6.031037.png)
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摘要
En 中文
We present the first experimental evidence, supported by theory and simulation, of spatio-temporal optical vortices (STOVs). A STOV is an optical vortex with phase and energy circulation in a spatiotemporal plane. Depending on the sign of the material dispersion, the local electromagnetic energy flow is saddle or spiral about the STOV. STOVs are a fundamental element of the nonlinear collapse and subsequent propagation of short optical pulses in material media, and conserve topological charge, constraining their birth, evolution, and annihilation. We measure a self-generated STOV consisting of a ring-shaped null in the electromagnetic field about which the phase is spiral, forming a dynamic torus that is concentric with and tracks the propagating pulse. Our results, here obtained for optical pulse collapse and filamentation in air, are generalizable to a broad class of nonlinearly propagating waves.
Keyword:
FEMTOSECOND FILAMENTATION
LASER
PULSES
AIR
DISLOCATIONS
PROPAGATION
DYNAMICS
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15.7
论文数:
2.7K
被引数:
3.4W
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