Journal
OPTICS COMMUNICATIONS
Volume 185, Issue 1-3, Pages 159-169Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0030-4018(00)00974-3
Keywords
Bessel beam; optical vortex; second harmonic generation
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Second harmonic generation of higher-order Bessel beams (Bessel vortices) formed by axicon was investigated in KTP crystal. A splitting of frequency-doubled Bessel vortex of topological charge 2n, n = 1, 2, 3, into 2n single-charged vortices was observed. The phenomenon is caused by copropagating zeroth-order Bessel beam acting as coherent background. (C) 2000 Elsevier Science B.V. All rights reserved.
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