A sharp resonant amplification of the third-order susceptibility of a diluted β-carotene solution in dodecane is observed by means of the time-resolved optical Kerr effect when the wavelength of the probe is tuned in the range of 490–570 nm. The resonance is well in the red with respect to the 0-0 first electronic transition; some evidence is given of the possible role of higher excited states and of two-photon resonance.
© 1992 Optical Society of America
Paolo Foggi, Valey F. Kamalov, Roberto Righini, and Renato Torre, "Resonance-enhanced time-resolved optical Kerr effect of β-carotene in solution," Opt. Lett. 17, 775-777 (1992)