Topological charge transformation of beams with embedded fractional phase step in the process of second harmonic generation

We demonstrate collinear second harmonic generation performed with a beam with an embedded initial phase singularity of strength l = 1 2 . We examine the law of topological charge conservation during this process. Despite the instability of the initial singularity, we observe a counterintuitive topo...

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Bibliographic Details
Published in:Journal of optics (2010) 2017-10, Vol.19 (10), p.105603
Main Authors: Stanislovaitis, Paulius, Matijosius, Aidas, Ivanov, Maksym, Smilgevicius, Valerijus
Format: Article
Language:English
Subjects:
fractional topological charge
law of conservation of topological charge
optical vortex
second harmonic generation
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Summary:We demonstrate collinear second harmonic generation performed with a beam with an embedded initial phase singularity of strength l = 1 2 . We examine the law of topological charge conservation during this process. Despite the instability of the initial singularity, we observe a counterintuitive topological charge doubling. In the second harmonic, we observe an optical vortex of strength (topological charge) l = 1 . The conservation of topological charge is confirmed by both numerical simulations and the experiment. We also provide a qualitative explanation of the process.
ISSN:2040-8978
0150-536X
2040-8986
DOI:10.1088/2040-8986/aa820d