| Autor: |
Nefe Jefferson Brito e Silva, Francisco das Chagas de Melo Brito, Henrique T.M.C.M. Baltar, Janildo Lopes Magalhães, Vicente Galber Freitas Viana, Francisco Eroni P. Santos, Hans A. Garcia |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Results in Optics, Vol 6, Iss , Pp 100205- (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2666-9501 |
| DOI: |
10.1016/j.rio.2021.100205 |
| Popis: |
In this work, we investigated the nonlinear response of norbixin (C24H28O4) in acetone. The third- and fifth-order optical nonlinearities were measured using the conventional Z-scan technique, with 357 fs laser pulses at 1040 nm and low-repetition rate (1 kHz). It is shown that, at intensities lower than 99 GW/cm2, the nonlinear refraction process was determined by the only third-order process. However, at higher intensities, the third- and fifth-order refractive nonlinearities coexist with opposite signs: n2 = (4.43 ± 0.44) × 10−16 cm2/W and n4 = (−4.65 ± 0.46) × 10−27 cm4/W2. On the other hand, the open-aperture Z-scan measurements show an effective three-photon absorption (3PA) with 9.19±0.92×10-23 cm4/W2. The physical mechanisms of the observed nonlinearity are also discussed. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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