Measurement of two-photon absorption using the photo-thermal lens effect |
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Authors: | A. Marcano O K. Williams N. Melikechi |
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Affiliation: | Center for Research and Education in Optical Sciences and Applications and Department of Physics and Pre-Engineering, Delaware State University, 1200N Dupont Highway, Dover, DE 19901, United States |
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Abstract: | We report on new schemes for pump-probe photo-thermal lens methods aimed for measuring the two-photon absorption coefficient of a given material. We show that by focusing a probe beam in the presence of a nearly collimated pump beam, we create a thermal lens which yields measurement of the two-photon absorption coefficient of nitrobenzene of (3.9 ± 0.3) 10−10 cm/W at 532 nm. We also show that when the pump field is focused in the presence of a nearly collimated probe beam the width of the z-scan signature of a two-photon absorption process is nearly one order of magnitude smaller than that of a one-photon process. We show experimental evidence of the effect obtained for nitrobenzene. |
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Keywords: | 78.20.N 42.70.M N 78.20.C |
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