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Phase singularities and spectral changes of spectrally partially coherent higher-order Bessel–Gauss pulsed beams

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Abstract

Phase singularities and spectral changes of spectrally partially coherent higher-order Bessel–Gauss pulsed beams in free-space propagation are studied, and the analytical expressions for the spectral degree of coherence and spectrum are derived. It is shown that there always exists an optical vortex at the center of the beam and the topological charge is conserved during the propagation. Some circular edge dislocations appear and the spectrum changes on propagation. A rapid spectral transition takes place. Numerical illustrative examples are given and the results are explained physically.

© 2009 Optical Society of America

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Equations (15)

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