Thermal-lens study of photochemical reaction kinetics

We consider the time dependence of the absorption coefficient due to the photoinduced chemical reaction (PCR) and species diffusion to calculate the temperature rise in the thermal-lens (TL) effect. The TL signal at the detector plane is also calculated. This theoretical approach removes the restric...

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Bibliographic Details
Published in:Optics letters 2009-11, Vol.34 (22), p.3460-3462
Main Authors: ASTRATH, Nelson G. C, ASTRATH, Francine B. G, JUN SHEN, JIANQIN ZHOU, MICHAELIAN, Kirk H, FAIRBRIDGE, Craig, MALACARNE, Luis C, PEDREIRA, Paulo R. B, MEDINA, A. N, BAESSO, Mauro L
Format: Article
Language:English
Subjects:
Beam trapping, self-focusing and defocusing
self-phase modulation
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Nonlinear optics
Optics
Physics
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Summary:We consider the time dependence of the absorption coefficient due to the photoinduced chemical reaction (PCR) and species diffusion to calculate the temperature rise in the thermal-lens (TL) effect. The TL signal at the detector plane is also calculated. This theoretical approach removes the restriction that the PCR time constant is much greater than the characteristic TL time constant, which was assumed in a previously published model. Hydrocarbon fuel and aqueous Cr(VI) samples are investigated, and quantitative experimental results for the thermal, optical, and PCR properties are obtained. While similar results were obtained for the Cr(VI) solution using the previous and present models, the relative difference between the PCR time constants extracted from the same experimental data for a hydrocarbon fuel sample is found to be more than 220%. This demonstrates the significant difference of the two models.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.34.003460