Abstract The modulational instability of two incoherently coupled beams in azobenzene-containing polymer with photoisomerization nonlinearity is investigated analytically and numerically. Our results show that as a precursor to spatial optical soliton formation, modulational instability can be adjusted and controlled by the wavelength combinations of the signal and background beams. We also discuss the dependences of strength of modulational instability on intensities of two signal beams and background beam. These findings make it possible to predict the formation of incoherently coupled soliton pairs in azobenzene-containing polymer.
Received: 08 April 2008
Revised: 05 July 2008
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10574167).
Cite this article:
Zhang Bing-Zhi(张冰志), Cui Hu(崔虎), and She Wei-Long (佘卫龙) Modulational instability of incoherently coupled beams in azobenzene-containing polymer with photoisomerization nonlinearity 2009 Chin. Phys. B 18 209
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