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Self-Trapping of Dark Incoherent Light Beams

Zhigang Chen, Matthew Mitchell, Mordechai Segev, Tamer H. Coskun and Demetrios N. Christodoulides
Science
New Series, Vol. 280, No. 5365 (May 8, 1998), pp. 889-892
Stable URL: http://www.jstor.org/stable/2896484
Page Count: 4
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Self-Trapping of Dark Incoherent Light Beams
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Abstract

"Dark beams" are nonuniform optical beams that contain either a one-dimensional (1D) dark stripe or a two-dimensional (2D) dark hole resulting from a phase singularity or an amplitude depression in their optical field. Thus far, self-trapped dark beams (dark solitons) have been observed using coherent light only. Here, self-trapped dark incoherent light beams (self-trapped dark incoherent wavepackets) were observed. Both dark stripes and dark holes nested in a broad partially spatially incoherent wavefront were self-trapped to form dark solitons in a host photorefractive medium. These self-trapped 1D and 2D dark beams induced refractive-index changes akin to planar and circular dielectric waveguides. The experiments introduce the possibility of controlling high-power coherent laser beams with low-power incoherent light sources such as light emitting diodes.

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