Thermally induced nonlinear optical response and optical power limiting of acid blue 40 dye

Pramodini, S and Poornesh, P and Nagaraja, K K (2013) Thermally induced nonlinear optical response and optical power limiting of acid blue 40 dye. Current Applied Physics, 13. pp. 1175-1182. ISSN 1567-1739

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We report the investigations of thermally induced third-order nonlinear optical and optical limiting characterizations for various concentrations of acid blue 40 dye in N,N-Dimethyl Formamide, studied by employing z-scan technique under cw HeeNe laser irradiation at 633 nm wavelength. The samples exhibited nonlinear absorption and nonlinear refraction under the experimental conditions. For lower concentration, the samples display both saturable absorption (SA) and reverse saturable absorption (RSA); whereas with increase in concentration, RSA behaviour prevails. The estimated values of the effective coefficients of nonlinear absorption beff, nonlinear refraction n2 and third-order nonlinear susceptibility c(3) were found to be of the order of 10�2 cm/W, 10�4 esu and 10�6 esu respectively. Multiple diffraction rings were observed when the samples were exposed to laser beam due to refractive index change and thermal lensing. The effect of concentration and the laser intensity on the selfdiffraction ring patterns was studied experimentally. The acid blue 40 dye also exhibited strong optical limiting properties under cw excitation and reverse saturable absorption is found to be the dominant nonlinear optical process leading to the observed nonlinear behaviour.

Item Type: Article
Additional Information: � 2013 Elsevier B.V.
Uncontrolled Keywords: Acid blue 40 dye Cw laser Z-scan NLO Optical limiting Diffraction rings
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 20 Aug 2013 06:55
Last Modified: 20 Aug 2013 06:55

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