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Second harmonic generation in multi-domain χ2 media: from disorder to order.

Authors
  • Ayoub, Mousa1
  • Imbrock, Jörg
  • Denz, Cornelia
  • 1 Institute of Applied Physics, Westfälische Wilhelms-Universität Münster, Münster, Germany. [email protected] , (Germany)
Type
Published Article
Journal
Optics Express
Publisher
The Optical Society
Publication Date
Jun 06, 2011
Volume
19
Issue
12
Pages
11340–11354
Identifiers
DOI: 10.1364/OE.19.011340
PMID: 21716364
Source
Medline
License
Unknown

Abstract

We investigate systematically the evolution of second harmonic generation in strontium barium niobate with different degrees of disorder of its χ2 nonlinearity. These different degrees of disordered domain structures are achieved through electrically switching of the polarization at room temperature. The size and distribution of the domains change during the poling process and this in turn strongly affects the spatial distribution of the second harmonic signal. The degree of disorder can be determined by analyzing the angular distribution and wavelength dependence of the second harmonic emission patterns combined with measurements of the spontaneous polarization. We demonstrate evidence of the control of the second harmonic emission pattern by creating defined states of order, and successfully reproduce the resulting patterns theoretically.

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