期刊
PHYSICAL REVIEW LETTERS
卷 112, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.193901
关键词
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资金
- European Social Fund under the Global Grant Measure [VP1-3.1-SMM-07-K-03-001]
- European Research Council under the European Union's Seventh Framework Programme/ERC [GA 306559]
- EPSRC [EP/J00443X/1, EP/J015040/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J015040/1, EP/J00443X/1] Funding Source: researchfish
We present a detailed experimental investigation which uncovers the nature of light bullets generated from self-focusing in a bulk dielectric medium with Kerr nonlinearity in the anomalous group velocity dispersion regime. By high dynamic range measurements of three-dimensional intensity profiles, we demonstrate that the light bullets consist of a sharply localized high-intensity core, which carries the self-compressed pulse and contains approximately 25% of the total energy, and a ring-shaped spatiotemporal periphery. Subdiffractive propagation along with dispersive broadening of the light bullets in free space after they exit the nonlinear medium indicate a strong space-time coupling within the bullet. This finding is confirmed by measurements of a spatiotemporal energy density flux that exhibits the same features as a stationary, polychromatic Bessel beam, thus highlighting the nature of the light bullets.
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