Two-photon absorption (TPA) and frequency-upconversion properties of a new upconversion laser dye trans-4-[p-(N-hydroxyethyl-N-methyl-amino)styryl]-N-meth-ylpyridinium toluene-p-sulfonate (abbreviated to HMASPS) were ...Two-photon absorption (TPA) and frequency-upconversion properties of a new upconversion laser dye trans-4-[p-(N-hydroxyethyl-N-methyl-amino)styryl]-N-meth-ylpyridinium toluene-p-sulfonate (abbreviated to HMASPS) were reported in this note. The linear absorption, TPA, single-photon induced fluorescence, TPA induced fluorescence and TPA induced upconverted lasing spectra of HMASPS solution in dimethyl formamide (abbreviated to DMF) were measured at room temperature. The red shift for the central wavelength of TPA induced fluorescence peak, which was compared with that of the single-photon induced fluorescence peak, and the blue shift for that of TPA induced up-converted lasing compared with that of TPA induced fluorescence, were explained by using re-absorption effect. TPA peak was at 930 nm. There is an 11 nm blue shift for two-photon energy of TPA peak compared with the linear absorption peak. The molecular TPA cross-section σ’2 at1064 nm was measured to be 6.0×10-48 cm4 .s/photon by using the open展开更多
Two carbazole-based polymerization initiators possessing blue fluorescence emission have been synthesized via Wittig reaction in the solid phase at room temperature.Two-photon excited fluorescence(TPEF) spectra for th...Two carbazole-based polymerization initiators possessing blue fluorescence emission have been synthesized via Wittig reaction in the solid phase at room temperature.Two-photon excited fluorescence(TPEF) spectra for them were investigated under 800 nm fs laser pulse and two-photon absorption cross sections were determined by the Z-scan technique.Then two-photon initiating polymerization(TPIP) microfabrication experiments were successfully carried out.Three-dimensional lattice and artificial defects were gained,indicating that they were viable candidates for the two-photon polymerization initiator in practical application of microfabrication.展开更多
The two-photon absorption（TPA）and TPA-induced frequency upconversion emission properties of the dyes 4-[P-（dicyanoethylamino）crystal]-N-methypyrdinium iodide and the complex of 4-[P-（dicyanoethylamino）crystal]-N...The two-photon absorption（TPA）and TPA-induced frequency upconversion emission properties of the dyes 4-[P-（dicyanoethylamino）crystal]-N-methypyrdinium iodide and the complex of 4-[P-（dicyanoethylamino）crystal]-N-methypyrdinium iodide and Ce（NO3）3 were experimentally studied.It was found that the TPA cross section for the dye sensitized by Ce3＋ is two factors larger than that of the dye without being sensitized.A three-level system model of the dye molecules was used to analyze the enhancement of TPA by the sensitizer Ce3＋,which indicated that the sensitizer results in the increase of the transition dipole moment from the one-photon allowed excited state（1Bu）to the two-photon allowed excited state（2Ag）.展开更多
Three dye-doped polymer rods in different matrices were synthesized in which weak hydrogen bond, strong hydrogen bond and covalent bond existed between the dye and the polymer chain. And the two-photon up-conversion...Three dye-doped polymer rods in different matrices were synthesized in which weak hydrogen bond, strong hydrogen bond and covalent bond existed between the dye and the polymer chain. And the two-photon up-conversion luminescent properties of HMASPS and HEASPS1 in three different microenvironments were studied.展开更多
A non-polar organic dye, E, E-1, 4-bis[4＇-（N,N-dibutylamino）styryl]-2,5-dimethoxybenzene （DBASDMB）, has been synthesized and characterized, and its structure has been determined. Pumped with a 200fs pulse this dy...A non-polar organic dye, E, E-1, 4-bis[4＇-（N,N-dibutylamino）styryl]-2,5-dimethoxybenzene （DBASDMB）, has been synthesized and characterized, and its structure has been determined. Pumped with a 200fs pulse this dye showed the up-conversion laser properties. The influences of various organic solvents and different pumping wavelength on the laser properties have been demonstrated.展开更多
使用双光子激光共聚焦显微镜对活体小鼠脑组织(体感皮层)进行形态学和细胞内Ca2+变化水平的观察和记录。方法是对小鼠开颅后向脑内注射Ca2+敏感荧光染料Oregon Green 488 BAPTA-1乙酰氧基甲酯,然后在双光子显微镜下观察并记录。双光子...使用双光子激光共聚焦显微镜对活体小鼠脑组织(体感皮层)进行形态学和细胞内Ca2+变化水平的观察和记录。方法是对小鼠开颅后向脑内注射Ca2+敏感荧光染料Oregon Green 488 BAPTA-1乙酰氧基甲酯,然后在双光子显微镜下观察并记录。双光子显微镜下的图像清晰生动,可扫描到大脑皮层以下较深区域,并能检测神经元细胞内Ca2+离子即时水平变化。实验结果表明通过注射Ca2+敏感荧光染料并结合多光子激光共聚焦显微镜观察活体动物脑部变化的方法可以得到高分辨率图像并且作为分析的来源。展开更多
基金The authors would like to thank Yang Zhaohe for the measurement of spectrum This work was supported by the State Key Program of China.
文摘Two-photon absorption (TPA) and frequency-upconversion properties of a new upconversion laser dye trans-4-[p-(N-hydroxyethyl-N-methyl-amino)styryl]-N-meth-ylpyridinium toluene-p-sulfonate (abbreviated to HMASPS) were reported in this note. The linear absorption, TPA, single-photon induced fluorescence, TPA induced fluorescence and TPA induced upconverted lasing spectra of HMASPS solution in dimethyl formamide (abbreviated to DMF) were measured at room temperature. The red shift for the central wavelength of TPA induced fluorescence peak, which was compared with that of the single-photon induced fluorescence peak, and the blue shift for that of TPA induced up-converted lasing compared with that of TPA induced fluorescence, were explained by using re-absorption effect. TPA peak was at 930 nm. There is an 11 nm blue shift for two-photon energy of TPA peak compared with the linear absorption peak. The molecular TPA cross-section σ’2 at1064 nm was measured to be 6.0×10-48 cm4 .s/photon by using the open
基金Supported by the National Natural Science Foundation of China (Grant Nos. 50532030, 20771001 & 50703001)Team for Scientific Innovation of Anhui Province (Grant No. 2006KJ007TD)
文摘Two carbazole-based polymerization initiators possessing blue fluorescence emission have been synthesized via Wittig reaction in the solid phase at room temperature.Two-photon excited fluorescence(TPEF) spectra for them were investigated under 800 nm fs laser pulse and two-photon absorption cross sections were determined by the Z-scan technique.Then two-photon initiating polymerization(TPIP) microfabrication experiments were successfully carried out.Three-dimensional lattice and artificial defects were gained,indicating that they were viable candidates for the two-photon polymerization initiator in practical application of microfabrication.
基金Supported by the National Natural Science Foundation of China(No.10074020).
文摘The two-photon absorption（TPA）and TPA-induced frequency upconversion emission properties of the dyes 4-[P-（dicyanoethylamino）crystal]-N-methypyrdinium iodide and the complex of 4-[P-（dicyanoethylamino）crystal]-N-methypyrdinium iodide and Ce（NO3）3 were experimentally studied.It was found that the TPA cross section for the dye sensitized by Ce3＋ is two factors larger than that of the dye without being sensitized.A three-level system model of the dye molecules was used to analyze the enhancement of TPA by the sensitizer Ce3＋,which indicated that the sensitizer results in the increase of the transition dipole moment from the one-photon allowed excited state（1Bu）to the two-photon allowed excited state（2Ag）.
基金This work was supported by the grant for State Key Program of China.
文摘Three dye-doped polymer rods in different matrices were synthesized in which weak hydrogen bond, strong hydrogen bond and covalent bond existed between the dye and the polymer chain. And the two-photon up-conversion luminescent properties of HMASPS and HEASPS1 in three different microenvironments were studied.
基金the State Key Program of China,the National Natural Science Foundation of China(50173015)NSFC/RGC(50218001)+1 种基金the Foundation for University Key Teacher by the Ministry of EducationChina Postdoctoral Foundation.
文摘A non-polar organic dye, E, E-1, 4-bis[4＇-（N,N-dibutylamino）styryl]-2,5-dimethoxybenzene （DBASDMB）, has been synthesized and characterized, and its structure has been determined. Pumped with a 200fs pulse this dye showed the up-conversion laser properties. The influences of various organic solvents and different pumping wavelength on the laser properties have been demonstrated.
文摘使用双光子激光共聚焦显微镜对活体小鼠脑组织(体感皮层)进行形态学和细胞内Ca2+变化水平的观察和记录。方法是对小鼠开颅后向脑内注射Ca2+敏感荧光染料Oregon Green 488 BAPTA-1乙酰氧基甲酯,然后在双光子显微镜下观察并记录。双光子显微镜下的图像清晰生动,可扫描到大脑皮层以下较深区域,并能检测神经元细胞内Ca2+离子即时水平变化。实验结果表明通过注射Ca2+敏感荧光染料并结合多光子激光共聚焦显微镜观察活体动物脑部变化的方法可以得到高分辨率图像并且作为分析的来源。
