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Measurement of Nonlinear Absorption Coefficients of Organic Materials by Mode-Mismatched Z-scan Thermal Lensing Technique

Volume 61, Number 10 (Oct. 2007) Page 1128-1133

Guerra, M.; Taouri, A.; Marcano O., A.; Cabrera, H.; Sylla, M.

We evaluate a new pump-probe mode-mismatched thermal lens (TL) scheme for the measurement of nonlinear absorption in nitrobenzene, benzene, and chloroform. In this new scheme the pump beam is focused in the presence of a collimated probe beam. Values of the nonlinear absorption coefficients of the materials studied for the wavelength of 532 nm are reported, and we compare the proposed technique with the well-known open Z-scan method.