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Non-diffracting broadband incoherent space-time fields
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DOI：10.1364/OPTICA.6.000598.png)
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Abstract
En 中文
Space-time (ST) wave packets are coherent pulsed beams that propagate diffraction free and dispersion free by virtue of tight correlations introduced between their spatial and temporal spectral degrees of freedom. Less is known of the behavior of incoherent ST fields that maintain the spatio-temporal spectral structure of their coherent wave-packet counterparts while losing all purely spatial or temporal coherence. We show here that structuring the spatio-temporal spectrum of an incoherent field produces broadband incoherent ST fields that are diffraction free. The intensity profile of these fields consists of a narrow spatial feature atop a constant background. Spatio-temporal spectral engineering allows controlling the width of this spatial feature, tuning it from a bright to a dark diffraction-free feature, and varying its amplitude relative to the background. These results pave the way to new opportunities in the experimental investigation of optical coherence of fields jointly structured in space and time by exploiting the techniques usually associated with ultrafast optics. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Keywords:
WAVE-PACKETS
PROPAGATION
LIGHT
COHERENCE
BEAMS
APERTURE
Journal
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8.5
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2.4K
Citations:
2.1W
