Theoretical and Experimental Investigation of Optical Nonlinearities in Methyl Orange

J. Del Nero; R.E. de Araujo; A.S.L. Gomes; C.P. de Melo

Laser 2001 - World of Photonics 15th International Conference on Lasers and Electrooptics in Europe
Technical Digest Series (Optica Publishing Group, 2001),
paper NM180

Theoretical and Experimental Investigation of Optical Nonlinearities in Methyl Orange

J. Del Nero, R.E. de Araujo, A.S.L. Gomes, and C.P. de Melo

The European Conference on Lasers and Electro-Optics 2001

Munich Germany
18–22 June 2001
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Nonlinear Materials I (NM)

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J. Del Nero, R. E. de Araujo, A. S. L. Gomes, and C. P. de Melo, "Theoretical and Experimental Investigation of Optical Nonlinearities in Methyl Orange," in Laser 2001 - World of Photonics 15th International Conference on Lasers and Electrooptics in Europe, Technical Digest Series (Optica Publishing Group, 2001), paper NM180.

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Abstract

It is well known that some molecules can change its structure upon different environmental conditions. Methyl Orange (C₁₄H₁₄N₃O₃S^-), as others pH indicators, has not only its linear optical properties modified by the acid concentration of its environment but its nonlinear optical coefficients also changes with the pH of the surrounding medium [1]. This knowledge has led to the exploitation of Nonlinear Optics as a tool to determine the equilibrium constant pKa in organic solutions [2].

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