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Proceedings Paper

Solvent effect on the third-order nonlinearity and optical limiting ability of a stilbazolium-like dye
Author(s): Wenfang Sun; Michael M. McKerns; Christopher M. Lawson; Gary M. Gray; Chuan-Lang Zhan; Duo-Yuan Wang
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Paper Abstract

Stilbazolium-like dyes, which contain different heterocyclic groups as electron donors and an N-methylpyridinium iodide group as an electron acceptor, are very interesting optical limiting materials. These materials exhibit low linear absorption, but potentially very strong nonlinear absorption at high intensities. In this paper, the results from investigations of the third-order susceptibilities and nonlinear refractive indices of a stilbazolium-like dye, trans-4-[2-(pyrryl)vinyl]-1-methylpyridinium iodide (PVPI), in different solvents using degenerate four wave mixing (DFWM) and Z-scan techniques with 6.8 ns laser pulses at 532 nm are reported. The molecular second-order hyperpolarizability of PVPI increases from 1.6x10-31 esu in methanol to 3.4x10-29 esu in chloroform, a factor of 212. The third-order nonlinearity of this compound is dominated by nonlinear absorption, which leads to strong optical limiting of nanosecond laser pulses. The strength of the optical limiting is dramatically influenced by the solvent used, with limiting decreasing in the order chloroform>dichloromethane, 1,2- dichloroethane>methanol, acetonitrile. While both nonlinear absorption and nonlinear scattering contribute to the optical limiting, nonlinear absorption is the dominant mechanism.

Paper Details

Date Published: 29 November 2000
PDF: 9 pages
Proc. SPIE 4106, Linear, Nonlinear, and Power-Limiting Organics, (29 November 2000); doi: 10.1117/12.408515
Show Author Affiliations
Wenfang Sun, Univ. of Alabama at Birmingham (United States)
Michael M. McKerns, Univ. of Alabama at Birmingham (United States)
Christopher M. Lawson, Univ. of Alabama at Birmingham (United States)
Gary M. Gray, Univ. of Alabama at Birmingham (United States)
Chuan-Lang Zhan, Institute of Photographic Chemistry (China)
Duo-Yuan Wang, Institute of Photographic Chemistry (China)


Published in SPIE Proceedings Vol. 4106:
Linear, Nonlinear, and Power-Limiting Organics
Manfred Eich; Christopher M. Lawson; Mark G. Kuzyk; Manfred Eich; Mark G. Kuzyk; Christopher M. Lawson; Robert A. Norwood, Editor(s)

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