We apply ultrafast single beam Z-scan technique to measure saturation absorption coefficients and nonlinear-refraction coefficients of primary alcohols at 1560 nm. The nonlinear effects result from vibronic transitions and cubic nonlinear-refraction. To measure the pure total third-order nonlinear susceptibility, we removed thermal effects with a frequency optimized optical-chopper. Our measurements of thermal-relaxation dynamics of alcohols, from 1560 nm thermal lens pump and 780 nm probe experiments revealed faster and slower thermal-relaxation timescales, respectively, from conduction and convection. The faster timescale accurately predicts thermal-diffusivity, which decreases linearly with alcohol chain-lengths since thermal-relaxation is slower in heavier molecules. The relation between thermal-diffusivity and alcohol chain-length confirms structure-property relationship. © 2008 Elsevier B.V. All rights reserved.
Bhattacharyya, I., Priyadarshi, S., & Goswami, D. (2009). Molecular structure-property correlations from optical nonlinearity and thermal-relaxation dynamics. Chemical Physics Letters, 469(1–3), 104–109. https://doi.org/10.1016/j.cplett.2008.12.064