Slow-accumulation optical nonlinearity in chlorophyll a solution

Li Sun; Shumei Wang

doi:10.1117/12.424628

1 May 2001 Slow-accumulation optical nonlinearity in chlorophyll a solution

Li Sun, Shumei Wang

Proceedings Volume 4268, Growth, Fabrication, Devices, and Applications of Laser and Nonlinear Materials; (2001) https://doi.org/10.1117/12.424628
Event: Photonics West 2001 - LASE, 2001, San Jose, CA, United States

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.

Citation Download Citation

Li Sun and Shumei Wang "Slow-accumulation optical nonlinearity in chlorophyll a solution", Proc. SPIE 4268, Growth, Fabrication, Devices, and Applications of Laser and Nonlinear Materials, (1 May 2001); https://doi.org/10.1117/12.424628

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