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|Fine structure in spatial self-phase modulation patterns: at a glance determination of the sign of optical nonlinearity in highly nonlinear films
Suchand Sandeep, C.S.
|IOP Publishing Ltd.
|Journal of Optics A: Pure and Applied Optics, 2009, Vol. 11(3), p034002
|We present a fast and simple method to determine the sign of the nonlinear coefficient n2 in films with high nonlinearity. The method exploits the effect of spatial self-phase modulation and the role of wavefront curvature that leads to a specific far field pattern that is dependent on the sign of n2 and on the sample position. The method can be considered a 'visualization' of the Z-scan for highly nonlinear films. Application to nematic liquid crystals under different experimental conditions confirms the results expected from the theory.
|2009 IOP Publishing Ltd.
|Appears in Collections:
|Research Papers (LAMP)
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