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

A. Marcano; K. Williams; N. Melikechi

doi:10.1117/12.731772

13 September 2007 High sensitivity photo-thermal lens method for measuring of two- photon absorption

A. Marcano, K. Williams, N. Melikechi

Proceedings Volume 6653, Linear and Nonlinear Optics of Organic Materials VII; 665308 (2007) https://doi.org/10.1117/12.731772
Event: Photonic Devices + Applications, 2007, San Diego, California, United States

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.

Citation Download Citation

A. Marcano, K. Williams, and N. Melikechi "High sensitivity photo-thermal lens method for measuring of two- photon absorption", Proc. SPIE 6653, Linear and Nonlinear Optics of Organic Materials VII, 665308 (13 September 2007); https://doi.org/10.1117/12.731772

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