Pramodini, S and Deepika, . and Sandhya, . and Rao, Ashok and Poornesh, P (2014) Studies on thermally induced third-order optical nonlinearity and optical power limiting response of Azure B under CW He–Ne laser excitation. Optics & LaserTechnology, 62. pp. 58-62.

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Abstract

We present the characterizations of thermally induced third-order nonlinearity, optical power limiting and self-induced diffraction rings In Azure B dye. Nonlinear measurements were carried out by employing the single beam z-scan technique. He–Ne laser operating in continuous wave mode at633 nm wavelength was used as the source of excitation. Azure B possesses self-defocusing type of nonlinearity. Self-diffraction rings pattern were observed due to thermal lensing and change in the refractive index. Nonlinear absorption process in Azure B was due to the reverse saturable absorption.The nonlinear refractive index n2, the nonlinear absorption coefficient βeff and the third-order optical susceptibility χ(3) werefoundtobeoftheorder10�5 esu, 10�2 cm/W and10�7 esu respectively. Azure B also displays good optical power handling capability of laser beam at the experimental wavelength,indicating the possible photonics device application such as all-optical power limiting

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