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Proceedings Paper

Slow-accumulation optical nonlinearity in chlorophyll a solution
Author(s): Li Sun; Shumei Wang
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Paper Abstract

This paper reports investigation on third-order nonlinear optical properties of chlorophyll a (Chl a), a kind of natural porphyrin derivative in organisms, by using Z-scan streak- camera system on nanosecond and picosecond time scale. Time- dependant behavior of the third-order optical nonlinearity was examined within duration of a picosecond pulse train along Z direction, and modulation of the transmitted pulses in the pulse train was temporally observed. A slow-accumulated optical nonlinearity was occurred in the diluted Chl a solution besides fast response optical nonlinearity of electronic origin. We propose that the slow-accumulated optical nonlinearity is originated from pileup of triplet states, and that the triplet states accumulation is attributed to enhancement of singlet-triplet orbit coupling brought about by intense optical field of the laser pulse.

Paper Details

Date Published: 1 May 2001
PDF: 9 pages
Proc. SPIE 4268, Growth, Fabrication, Devices, and Applications of Laser and Nonlinear Materials, (1 May 2001); doi: 10.1117/12.424628
Show Author Affiliations
Li Sun, Yantai Univ. (China)
Shumei Wang, Yantai Univ. (China)

Published in SPIE Proceedings Vol. 4268:
Growth, Fabrication, Devices, and Applications of Laser and Nonlinear Materials
Jeffrey W. Pierce; Kathleen I. Schaffers; Kathleen I. Schaffers, Editor(s)

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