1. Three-Photon Absorption and Upconversion Fluorescence Properties of Series 1,3,4-Oxadiazole Derivatives
- Author
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Liu Chang, Wang Zhu-Yuan, Qian Ying, LU Chang-Gui, Cui Yi-Ping, and Huang Wei
- Subjects
Materials science ,business.industry ,Physics::Optics ,General Physics and Astronomy ,Trimer ,Laser ,Molecular physics ,Fluorescence ,Photon upconversion ,law.invention ,Wavelength ,Optics ,law ,Femtosecond ,Molecule ,business ,Absorption (electromagnetic radiation) - Abstract
A newly synthesized 1,3,4-oxadiazole derivatives have been studied using a femtosecond Ti:sapphire laser system. The series molecules present strong three-photon absorption and frequency upconversion fluorescence at wavelengths from 1205nm to 1575nm. Furthermore, there is no proportional relationship between three-photon absorption cross sections and the chemical structure transformation from monomer, dimer to trimer. Effective charge-transfer distance by π-conjugation bonds may be the contributing factor. In the experimental design, the far-field intensity distribution of femtosecond laser beam has been taken into account. We give the optimized analytical solution of nonlinear transmission in a three-photon absorption (3PA) process when the incident beam has a Gaussian transverse spatial profile.
- Published
- 2008