Optical power limiting in solutions of polyphenylquinoxalines

Brian R. Kimball; Masato Nakashima; Joseph F. Roach; Adam J. Jaglowski Jr.; Francisco J. Aranda; Devulapalli V. G. L. N. Rao

doi:10.1117/12.253475

7 October 1996 Optical power limiting in solutions of polyphenylquinoxalines

Brian R. Kimball, Masato Nakashima, Joseph F. Roach, Adam J. Jaglowski Jr., Francisco J. Aranda, Devulapalli V. G. L. N. Rao

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Proceedings Volume 2853, Nonlinear Optical Liquids; (1996) https://doi.org/10.1117/12.253475
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Two-photon absorption, excited state absorption, nonlinear refraction and scattering are the processes explored for optical power limiting applications. We report a novel approach for power limiting in polyphenylquinoxalines (PPQ) solutions based on two-photon induced cluster formation. The samples of PPQ were measured in solution in chloroform. The solutions are completely transparent at 532 nm. The contributions of the real and imaginary parts of the susceptibility were studied using the Z-scan technique. The nonlinear index of refraction of the samples is found to be positive. Open aperture Z-scan experiments indicate two photon absorption induced cluster formation and scattering. Values for the effective nonlinear absorption coefficient and the nonlinear index of refraction were obtained. Though two-photon absorption is responsible for triggering the process of cluster formation, optical power limiting in this case is due both to two-photon absorption and to scattering of light by the molecular clusters. The process of two- photon absorption and induced scattering yield a very attractive figure of merit of 10.3 for a solution sample of 2 mg/ml concentration compared to values reported in the recent literature. PPQ is an interesting candidate for applications in optical power limiting.

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Brian R. Kimball, Masato Nakashima, Joseph F. Roach, Adam J. Jaglowski Jr., Francisco J. Aranda, and Devulapalli V. G. L. N. Rao "Optical power limiting in solutions of polyphenylquinoxalines", Proc. SPIE 2853, Nonlinear Optical Liquids, (7 October 1996); https://doi.org/10.1117/12.253475

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KEYWORDS

Absorption

Scattering

Refraction

Light scattering

Polymers

Saturable absorption

Transmittance

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