Thermo-optical parameters, including the refractive index temperature coefficient (d<i>n</i>/d<i>T</i>) and the absolute non-radiative quantum efficiency (Φ), were determined in solutions of a natural dye using a method based on thermally driven self-phase modulation (SPM) effects. The ring-pattern response to SPM effects was determined for annatto extracts obtained from the seeds of the tropical shrub <i>Bixa orellana L</i>. This approach determined the linear behavior of the ring numbers (<i>n</i>) observed in the far-field region as a function of excitation laser power (<i>P</i><sub>e</sub>). Thermo-optical characterizations of bixin (C<sub>25</sub>H<sub>30</sub>O<sub>4</sub>) solutions extracted using three solvents (toluene, chloroform, and acetone) were performed. The Φ results are in good experimental agreement with those obtained using the thermal lens (TL) technique. Values obtained for thermal diffusivity parameters were typical for pure solvents.

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