Investigation of Third-Order Nonlinear Optical Properties of Pyrazoline-Doped Polyvinyl Alcohol Films

Janardhana, K and Ravindrachary, V and Kumar , Rajesh P C and Ismayil, . (2013) Investigation of Third-Order Nonlinear Optical Properties of Pyrazoline-Doped Polyvinyl Alcohol Films. Polymer Engineering and Science, 53. pp. 1958-1967. ISSN 1548-2634

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Abstract

A 2-pyrazoline,3-(phenyl)-5-(4-N,N-dimethylaminophenyl)- 1H-2-pyrazoline (PDAP) was synthesized and characterized by Fourier transform infrared, nuclear magnetic resonance, ultraviolet (UV)–visible, and Z-scan techniques. The PDAP-doped polyvinyl alcohol composite films were prepared by solvent casting method using dimethylformamide as solvent. The optical properties of the composites were studied using UV–visible, steady state fluorescence, single beam Z-scan technique and degenerate four wave mixing (DFWM) technique. The optical constants such as band gap and optical activation energy were evaluated. The steady state fluorescence data showed both emission peak wavelengths and intensity change with PDAP-doping level in the composites. The open aperture Z-scan of the composite films displayed reverse saturable absorption. A self-focusing effect was observed under closed aperture configuration and the nonlinear refractive index of the film was observed increasing with the increase of doping. The third-order nonlinear susceptibility was compared with that obtained with picoseconds pulses through DFWM technique. The thermogravimetry analysis shows that the composites are thermally stable up to 2608C. POLYM. ENG. SCI., 53:1958–1967, 2013. ª2013 Society of Plastics Engineers

Item Type: Article
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 15 Feb 2014 06:27
Last Modified: 11 Jun 2015 11:52
URI: http://eprints.manipal.edu/id/eprint/138726

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