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- W2101304179 abstract "Summary form only given. Spontaneous degenerate parametric scattering [down-conversion] is a 3-photon process with one pump photon of frequency 2/spl omega/ and two output photons of frequency /spl omega/. An optical vortex is defined as a beam containing a phase singularity, i.e. the change of phase around the center of the beam equals 2 /spl pi/m; where the integer m is the topological charge. Our experimental results using a BaB/sub 2/O/sub 4/ crystal under type II phase matching conditions and numerical simulations suggest that the vortex in the pump beam is transformed into a speckle-like structure, effectively that structure is composed of randomly occurring vortex and Gaussian beams. The two down-converted output signals (signal and idler) appear as rings of orthogonal polarization and, therefore, can be easily distinguished." @default.
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- W2101304179 date "2000-05-12" @default.
- W2101304179 modified "2023-09-26" @default.
- W2101304179 title "Transformation of topological charge in optical down conversion" @default.
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