Abstract

Three-photon-absorption-induced frequency-upconversion fluorescence emission has been observed in a solution of 2,5-benzothiazole 3,4-didecyloxy thiophene (BBTDOT) in tetrahydrofuran, pumped with 10-ns Q-switched 1.06-μm laser pulses. The spectral peak of the observed fluorescence emission is located in the 450–480-nm range, and the intensity dependence of the visible emission on the IR excitation obeys the cubic law. At a higher solute concentration (0.18 M/L) and moderate IR excitation intensity levels (50–200 MW/cm²), obvious optical limiting behavior has been observed as a result of three-photon absorption. The measured nonlinear absorption coefficient and the corresponding molecular three-photon-absorption cross section are γ = 2.7 × 10⁻¹⁸ cm³/W² and ${\sigma }_3^{\prime }=8.8\times {10}^{-76}\hspace{0.17em}{\text{cm}}^6\hspace{0.17em}{\text{s}}^2$, respectively.

© 1995 Optical Society of America

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