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Three-Photon Absorption and Upconversion Fluorescence Properties of Series 1,3,4-Oxadiazole Derivatives |
HUANG Wei1;LU Chang-Gui1;QIAN Ying2;LIU Chang1;WANG Zhu-Yuan1,
CUI Yi-Ping1 |
| 1Advanced Photonics Center, Southeast University, Nanjing 2100962School of Chemistry and Chemical Engineering, Southeast University, Nanjing 210096 |
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| Cite this article: |
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HUANG Wei, LU Chang-Gui, QIAN Ying et al 2008 Chin. Phys. Lett. 25 974-977 |
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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.
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| Keywords:
42.65.Ky
33.50.Dq
42.70.Jk
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Received: 21 September 2007
Published: 27 February 2008
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| PACS: |
42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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33.50.Dq
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(Fluorescence and phosphorescence spectra)
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42.70.Jk
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(Polymers and organics)
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