Fifth-order nonlinear optical response of Alq3 thin films

Saleh A, Li W, Alqahtani H, Neuhaus M, Alshehri A, Bergues B, Alharbi M, Kling MF, Azzeer AM, Wang Z, Alharbi AF (2022)

Publication Type: Journal article

Publication year: 2022


Book Volume: 37

Article Number: 105513

DOI: 10.1016/j.rinp.2022.105513


The fifth-order optical nonlinearity of Tris-(8-hydroxyquinoline) aluminium (Alq3) thin films deposited on quartz substrates when exposed to an intense laser excitation of mid-infrared femtosecond pulses is investigated. This property was examined by generating the fifth-harmonic frequency of the driving field whose signal strength as a function of laser intensity is well described by a power-law scaling. The perturbative nature of the underlying mechanism enabled the linking of the process directly to the fifth-order nonlinear optical susceptibility χ(5). We also utilized the open-aperture z-scan for studying the nonlinear absorption aspect of the third-order nonlinear optical properties of the sample. It was found that Alq3 thin-films inherit the same saturable absorption character reported in Alq3 solutions under continuous laser excitation in the visible range, with a comparable value of the nonlinear absorption coefficient βeff (in the order of 10−2 cm/W).

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How to cite


Saleh, A., Li, W., Alqahtani, H., Neuhaus, M., Alshehri, A., Bergues, B.,... Alharbi, A.F. (2022). Fifth-order nonlinear optical response of Alq3 thin films. Results in Physics, 37.


Saleh, Ahmad, et al. "Fifth-order nonlinear optical response of Alq3 thin films." Results in Physics 37 (2022).

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