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The absorption of a monochromatic plane wave in a medium exhibiting linear, two- and three-photon absorption is investigated theoretically. An approximate closed-form expression is derived for the optical intensity. An effective two-photon absorption coefficient is then defined. Using the theoretical results, the absorption coefficients from transmission measurements are determined. Experiment is done in a highly absorbing nonlinear material such as As 2 Se 3 to illustrate our theoretical results. Good agreement is found between experimental data and numerical simulation based on our model. Measurements of nonlinear coefficients characterizing the two- and three-photon absorption are given.
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Sanchez et al. (2004) studied this question.
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