Three-Photon Absorption and Upconversion Fluorescence Properties of Series 1,3,4-Oxadiazole Derivatives  

作　　者：黄维 吕昌贵 钱鹰 刘畅 王著元 崔一平 

机构地区：[1]Advanced Photonics Center, Southeast University, Nanjing 210096 [2]School of Chemistry and Chemical Engineering, Southeast University, Nanjing 210096

出　　处：《Chinese Physics Letters》2008年第3期974-977,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 60708024 and 60678042, and the Natural Science Foundation of Jiangsu Province （BK2006553）.

摘　　要：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 upeonversion fluorescence at wavelengths from 1205 nm to 1575 nm. 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.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 upeonversion fluorescence at wavelengths from 1205 nm to 1575 nm. 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.

关 键 词：supernova explosion proto-neutron star shock wave 

分 类 号：O43[机械工程—光学工程]