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Proceedings Paper

High sensitivity photo-thermal lens method for measurement of two-photon absorption
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Paper Abstract

We present a two-beam mode-mismatched thermal lens method for pulse excitation aimed for the determination of one- and two-photon absorption coefficient with high sensitivity. In this scheme the excitation beam is focused onto the sample in the presence of a collimated CW probe light of low power. The Z-scan signature is single peaked with a width that depends on the number of photons involved in the absorption. We show that the method is at least two orders of magnitude more sensitive than the well-known open Z-scan transmission method commonly used for multi-photon absorption measurement. Using the proposed method we measure a two photon absorption coefficient for nitrobenzene of β=1.12 10-10 cm/W for nanosecond pulses and a wavelength of 532 nm.

Paper Details

Date Published: 13 September 2007
PDF: 9 pages
Proc. SPIE 6653, Linear and Nonlinear Optics of Organic Materials VII, 665308 (13 September 2007); doi: 10.1117/12.731772
Show Author Affiliations
A. Marcano, Delaware State Univ. (United States)
K. Williams, Delaware State Univ. (United States)
N. Melikechi, Delaware State Univ. (United States)

Published in SPIE Proceedings Vol. 6653:
Linear and Nonlinear Optics of Organic Materials VII
Jean-Michel Nunzi, Editor(s)

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