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Investigation of ultrafast dynamics of CdTe quantum dots by femtosecond fluorescence up-conversion spectroscopy 被引量:3
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作者 姚关心 吕良宏 +5 位作者 桂美芳 张先燚 郑贤锋 季学韩 张宏 崔执凤 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第10期466-471,共6页
The ultrafast carrier relaxation processes in CdTe quantum dots are investigated by femtosecond fluorescence upconversion spectroscopy.Photo-excited hole relaxing to the edge of the forbidden gap takes a maximal time ... The ultrafast carrier relaxation processes in CdTe quantum dots are investigated by femtosecond fluorescence upconversion spectroscopy.Photo-excited hole relaxing to the edge of the forbidden gap takes a maximal time of ~ 1.6 ps with exciting at 400 nm,depending on the state of the photo-excited hole.The shallow trapped states and deep trap states in the forbidden gap are confirmed for CdTe quantum dots.In addition,Auger relaxation of trapped carriers is observed to occur with a time constant of ~ 5 ps.A schematic model of photodynamics is established based on the results of the spectroscopy studies.Our work demonstrates that femtosecond fluorescence up-conversion spectroscopy is a suitable and effective tool in studying the transportation and conversion dynamics of photon energy in a nanosystem. 展开更多
关键词 CdTe quantum dots femtosecond fluorescence up-conversion spectroscopy ultrafast dynamics NANOMATERIAL
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Rapid internal conversion in a symmetric molecule LD 700 studied by means of femtosecond fluorescence depletion 被引量:1
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作者 郭逊敏 宛岩 +3 位作者 夏安东 王素凡 刘建勇 韩克利 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第1期142-148,共7页
The rapid internal conversion dynamics at room temperature is determined by using the femtosecond time-resolved fluorescence depletion measurements of a complex solvated molecule of LD 700 (rhodamine 700) combined w... The rapid internal conversion dynamics at room temperature is determined by using the femtosecond time-resolved fluorescence depletion measurements of a complex solvated molecule of LD 700 (rhodamine 700) combined with steadystate absorption and fluorescence spectroscopy, as well as quantum chemical calculation. The molecule is excited by a 50 fs laser pulse at 400 nm which directly populated the highly excited singlet state, the rapid internal conversions (ICs) are observed, which leads to the directional changes of the emission transition moment following photoexcitation to the highly excited singlet state S5 of LD 700. 展开更多
关键词 femtosecond fluorescence depletion internal conversion (IC) SOLVATION
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Up-Conversion Properties of Oxy-Fluoride Glasses Co-Doped with Ho^(3+) and Yb^(3+) 被引量:3
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作者 王伟忠 曲万春 +2 位作者 杨魁胜 李岩 何广海 《Journal of Rare Earths》 SCIE EI CAS CSCD 2006年第z2期187-190,共4页
Oxy-fluoride glasses with composition of 25SiO2-65PbF2-9.4AlF3-0.1HoF3-0.5YbF3 were prepared. Their up-conversion fluorescence characteristics were investigated by 980 nm laser. Two emission peaks were observed at 540... Oxy-fluoride glasses with composition of 25SiO2-65PbF2-9.4AlF3-0.1HoF3-0.5YbF3 were prepared. Their up-conversion fluorescence characteristics were investigated by 980 nm laser. Two emission peaks were observed at 540 and 650 nm. The up-conversion mechanism and processes were analyzed. The relationship between pumping power and relative intensity of emissions was discussed. From the dependence, it is known that the emissions centered at 540 and 650 nm are both attributed to two-photon process. 展开更多
关键词 oxy-fluoride glasses Yb3+/Ho3+ ions up-conversion fluorescence rare earths
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Green and red up-conversion emissions and thermometric application of Er^(3+) -doped silicate glass 被引量:3
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作者 李成仁 董斌 +1 位作者 李磊 雷明凯 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第1期224-227,共4页
The green and red up-conversion emissions centred at about 534, 549 and 663 nm of wavelength, corresponding respectively to the ^2H11/2 → ^4I15/2, ^4S3/2 → ^4I15/2 and ^4F9/2 → ^4I15/2 transitions of Er^3+ ions, h... The green and red up-conversion emissions centred at about 534, 549 and 663 nm of wavelength, corresponding respectively to the ^2H11/2 → ^4I15/2, ^4S3/2 → ^4I15/2 and ^4F9/2 → ^4I15/2 transitions of Er^3+ ions, have been observed for the Er^3+-doped silicate glass excited by a 978 nm semiconductor laser beam. Excitation power dependent behaviour of the up-conversion emission intensity indicates that a two-photon absorption up-conversion process is responsible for the green and red up-conversion emissions. The temperature dependence of the green up-conversion emissions is also studied in a temperature range of 296-673 K, which shows that Er^3+-doped silicate glass can be used as a sensor in high-temperature measurement. 展开更多
关键词 Er^3+-doped silicate glass up-conversion emission fluorescence intensity ratio
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Compact and robust dual-color linearly polarized illumination source for three-photon fluorescence imaging
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作者 Jiazheng Song Yanyan Zhang Yuanshan Liu 《Journal of Innovative Optical Health Sciences》 SCIE EI CSCD 2023年第5期69-76,共8页
The miniaturized femtosecond laser in near infrared-Ⅱregion is the core equipment of threephoton microscopy.In this paper,we design a compact and robust illumination source that emits dual-color linearly polarized li... The miniaturized femtosecond laser in near infrared-Ⅱregion is the core equipment of threephoton microscopy.In this paper,we design a compact and robust illumination source that emits dual-color linearly polarized light for three-photon microscopy.Based on an all-polarizationmaintaining passive mode-locked fiber laser,we shift the center wavelength of the pulses to the 1.7m band utilizing cascade Raman effect,thereby generate dual-wavelength pulses.To enhance clarity,the two wavelengths are separated through the graded-index multimode fiber.Then we obtain the dual-pulse sequences with 1639.4 nm and 1683.7 nm wavelengths,920 fs pulse duration,and 23.75 MHz pulse repetition rate.The average power of the signal is 53.64mW,corresponding to a single pulse energy of 2.25 nJ.This illumination source can be further amplified and compressed for three-photon fluorescence imaging,especially dual-color three-photon fluorescence imaging,making it an ideal option for biomedical applications. 展开更多
关键词 Three-photon fluorescence imaging illumination source dual-wavelength femtosecond pulse cascaded Raman effect graded-index multimodefiber.
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Microstructured fluorescence in liquid crystals with femtosecond laser excitation
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作者 孟霞 金萍 +4 位作者 葛士军 刘娇 李炳祥 王磊 陆延青 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第3期154-158,共5页
This study investigated direct fluorescence generation from a nematic liquid crystal(NLC)NJU-LDn-4 under femtosecond laser excitation.The absorption,transmittance,excitation,and emission spectra of the NLC were assess... This study investigated direct fluorescence generation from a nematic liquid crystal(NLC)NJU-LDn-4 under femtosecond laser excitation.The absorption,transmittance,excitation,and emission spectra of the NLC were assessed.The relationship between the femtosecond pump power and fluorescence intensity was analyzed,revealing a quadratic increase and indicating that two-photon absorption(2PA)is the primary fluorescence mechanism.The LC microstructure was designed using photoalignment technology,allowing the generated fluorescence to reflect the corresponding structure.This research can establish a foundation for tunable LC microstructured fluorescence,with potential applications in fluorescence microscopy and optoelectronics. 展开更多
关键词 liquid crystal femtosecond laser fluorescence MICROSTRUCTURE
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INTRACELLULAR MANIPULATION BY FEMTOSECOND LASERS:REVIEW 被引量:2
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作者 WATARU WATANABE SACHIHIIRO MATSUNAGA +1 位作者 KIICHI FUKUI KAZUYOSHI ITOH 《Journal of Innovative Optical Health Sciences》 SCIE EI CAS 2009年第1期1-8,共8页
Multiphoton absorption of femtosecond laser pulses focused through an objective with high numerical aperture(NA)can be used to image and manipulate cellular and intracellular objects.This review highlights recent adva... Multiphoton absorption of femtosecond laser pulses focused through an objective with high numerical aperture(NA)can be used to image and manipulate cellular and intracellular objects.This review highlights recent advances in intracellular manipulation,including nanosurgery and labeling in living cells with femtosecond lasers. 展开更多
关键词 femtosecond laser nanosurgery ablation multiphoton microscopy photoconvertible fluorescent protein
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Two-photon absorption and stimulated emission in poly-crystalline Zinc Selenide with femtosecond laser excitation 被引量:1
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作者 Qianliang Li Walter Perrie +2 位作者 Zhaoqing Li Stuart P Edwardson Geoff Dearden 《Opto-Electronic Advances》 SCIE EI 2022年第1期1-12,共12页
The optical nonlinearity in polycrystalline zinc selenide(ZnSe),excited with 775 nm,1 kHz femtosecond laser pulses was investigated via the nonlinear transmission with material thickness and the Z scan technique.The m... The optical nonlinearity in polycrystalline zinc selenide(ZnSe),excited with 775 nm,1 kHz femtosecond laser pulses was investigated via the nonlinear transmission with material thickness and the Z scan technique.The measured two photon absorption coefficientβwas intensity dependent,inferring that reverse saturated absorption(RSA)is also relevant dur-ing high intensity excitation in ZnSe.At low peak intensity I<5 GW cm^(-2),we findβ=3.5 cm GW^(-1) at 775 nm.The spec-tral properties of the broad blueish two-photon induced fluorescence(460 nm-500 nm)was studied,displaying self-ab-sorption near the band edge while the upper state lifetime was measured to be τ_(e)~3.3 ns.Stimulated emission was ob-served when pumping a 0.5 mm thick polycrystalline ZnSe sample within an optical cavity,confirmed by significant line narrowing fromΔλ=11 nm(cavity blocked)toΔλ=2.8 nm at peak wavelength λ_(p)=475 nm while the upper state life-time also decreased.These results suggest that with more optimum pumping conditions and crystal cooling,polycrystal-line ZnSe might reach lasing threshold via two-photon pumping atλ=775 nm. 展开更多
关键词 ZNSE femtosecond laser nonlinear absorption stimulated emission fluorescence
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Novel colorimetric,photothermal and up-conversion fluorescence triple-signal sensor for rosmarinic acid detection
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作者 Yinyin Chen Xiujuan Yang +3 位作者 Changfang Lu Zouping Yang Wei Wu Xianxiang Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2023年第8期275-281,共7页
Rosmarinic acid(RA)is promising as a natural and nontoxic food additive.However,many analysis methods for RA generally depend on large instruments and single signals for quantitative detection.A new upconversion fluor... Rosmarinic acid(RA)is promising as a natural and nontoxic food additive.However,many analysis methods for RA generally depend on large instruments and single signals for quantitative detection.A new upconversion fluorescence,colorimetric and photothermal multi-modal sensing strategy is developed for the quantification of RA.β-cyclodextrin(CD)modified citric acid(Cit)wrapped NaYF_(4):Yb/Er-Cit-CD(Y:Yb/Er-Cit-CD)up-conversion nanocomposite has been synthesized,which emits green fluorescence at 550nm under 980nm near-infrared(NIR)excitation.In the presence of oxidized 3,3',5,5'-tetramethylbenzidine(oxTMB),the green fluorescence is significantly quenched attributed to the fluorescence inner filter effect(IFE)between oxTMB and Y:Yb/Er-Cit-CD.When RA is intervened,blue oxTMB is reduced to colorless 3,3',5,5'-tetramethylbenzidine(TMB)inducing the recovery of up-conversion fluorescence.At the same time,colorimetric and photothermal signals readout can be easily achieved thanks to the color indication and photothermal effect of the oxTMB.The constructed Y:Yb/Er-Cit-CD/oxTMB sensor displays high sensitivity,visibility and simplicity for RA,and the limits of detection(LOD)for fluorescence,colorimetric and photothermal were 0.004μmol/L,0.036μmol/L and 0.043μmol/L,respectively.This sensing system is successfully performed for the detection of RA in food samples. 展开更多
关键词 Multi-modal sensing up-conversion fluorescence COLORIMETRIC PHOTOTHERMAL Rosmarinic acid
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基于飞秒激光与纳秒激光协同多光子诱导荧光的火焰中氢原子瞬态检测
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作者 李博 李帅瑶 +2 位作者 韩磊 高强 刘艳 《计测技术》 2024年第1期88-93,共6页
为了准确测量碳氢燃料燃烧过程中原位氢原子,提出了飞秒-纳秒激光协同激发的氢原子瞬态在线探测策略。以243 nm的飞秒激光经过双光子过程将基态氢原子激发到2S能级,随后这些氢原子再被656 nm的纳秒激光激发到3P能级,通过探测3P-2S的荧... 为了准确测量碳氢燃料燃烧过程中原位氢原子,提出了飞秒-纳秒激光协同激发的氢原子瞬态在线探测策略。以243 nm的飞秒激光经过双光子过程将基态氢原子激发到2S能级,随后这些氢原子再被656 nm的纳秒激光激发到3P能级,通过探测3P-2S的荧光发射,实现了宽当量比范围的氢原子无干扰瞬态在线测量。实验结果表明:通过飞秒-纳秒协同的方式,可以有效降低激光光解产生的氢原子对原位氢原子探测的干扰。 展开更多
关键词 氢原子测量 飞秒激光 激光诱导荧光 在线测量
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Nitrogen fluorescence induced by the femtosecond intense laser pulses in air 被引量:1
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作者 He Li Suyu Li +7 位作者 Shuchang Li Dunli Liu Dan Tian Anmin Chen Ying Wang Xiaowei Wang Yunfeng Zhang Mingxing Jin 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2016年第1期45-51,共7页
Our experiments show that external focusing and initial laser energy strongly influences filament generated by the femtosecond Ti–sapphire laser in air. The experimental measurements show the filament length can be e... Our experiments show that external focusing and initial laser energy strongly influences filament generated by the femtosecond Ti–sapphire laser in air. The experimental measurements show the filament length can be extended both by increasing the laser energy and focal length of focusing lens. On the other hand, the plasma fluorescence emission can be enhanced by increasing the laser energy with fixed focal length or decreasing the focal length. In addition, the collapse distance measured experimentally are larger than the calculated ones owing to the group-velocity-dispersion effect. In addition, we find that the line widths of the spectral lines from N2 is independent of filament positions, laser energies and external focusing. 展开更多
关键词 femtosecond LASER FILAMENT fluorescence
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Optimal spectral phase control of femtosecond laser-induced up-conversion luminescence in Sm^3+:NaYF4 glass 被引量:1
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作者 Jian-Ping Li Lian-Zhong Deng +5 位作者 Ye Zheng Peng-Peng Ding Tian-Qing Jia Zhen-Rong Sun Jian-Rong Qiu Shi-An Zhang 《Frontiers of physics》 SCIE CSCD 2020年第2期63-68,共6页
The spectral phase of the femtosecond laser field is an important parameter that affects the up-conversion(UC)luminescence efficiency of dopant lanthanide ions.In this work,we report an experi-mental study on controll... The spectral phase of the femtosecond laser field is an important parameter that affects the up-conversion(UC)luminescence efficiency of dopant lanthanide ions.In this work,we report an experi-mental study on controlling the UC lmiiinescence efficiency in Sm^3+:NaYF4 glass by 800-nm femtosec-ond laser pulse shaping using spectral phase modulation.The optimal phase control strategy efficiently enhances or suppresses the UC luminescence intensity.Based on the laser-power dependence of the UC luminescence intensity and its comparison with the luminescence spectrum under direct 266-nm fem-tosecond lciser irradiation,we propose herein an excitation model combining non-resonant two-photon absorption with resonance-media ted three-photon absorption to explain the experimental observations. 展开更多
关键词 up-conversion luminescence rare earth ions quantum control femtosecond laser SPECTRAL phase
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飞秒激光作用下的硅表面微结构及发光特性 被引量:18
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作者 门海宁 程光华 孙传东 《强激光与粒子束》 EI CAS CSCD 北大核心 2006年第7期1081-1084,共4页
采用近红外飞秒激光辐照浸泡在硫酸溶液中的N型单晶硅片,激光波长800nm。脉宽200fs。重频1kHz,平均功率为100mw,而硫酸溶液的质量分数分别选择为0.1%和1%。辐照后硅表面呈直径为5~8pm,高度15pm的柱型结构。分析其荧光特性,并... 采用近红外飞秒激光辐照浸泡在硫酸溶液中的N型单晶硅片,激光波长800nm。脉宽200fs。重频1kHz,平均功率为100mw,而硫酸溶液的质量分数分别选择为0.1%和1%。辐照后硅表面呈直径为5~8pm,高度15pm的柱型结构。分析其荧光特性,并通过比较硅材料表面微结构与激光光源、扫描参数、硅片背景环境的关系,确定最佳辐照条件为激光扫描速度750pm/s,扫描间距5m/s。最终在厚度0.5mm、直径26mm的硅片上获得10mm×10mm的方形扫描区域,荧光光谱显示激光扫描后的区域在700nm附近有很强的荧光发射。分析结果表明飞秒激光扫描改变了样品的表面微结构尺寸,增大了吸收面积,扩展了荧光激发波长,有效提高了样品的吸收效率和荧光发光相对强度(超过扫描前发光相对强度的2倍),荧光发射谱的变化是由量子限制效应和表面态模型共同作用的结果。 展开更多
关键词 单晶硅 飞秒激光 微结构 荧光特性
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假根羽藻外周天线内能量传递的飞秒光谱研究(英文) 被引量:4
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作者 张苏娟 王水才 +1 位作者 贺俊芳 陈晖 《光子学报》 EI CAS CSCD 北大核心 2006年第2期166-170,共5页
在时间相关单光子技术的基础上,对假根羽藻外周天线内叶绿素分子间的能量传递进行研究.采用瞬态吸收与荧光发射谱识别样品内的具有特征光谱组分的分子,得到在叶绿素分子的Q带区主要存在以下六个特征分子Chlb630,Chlb642,Chla665523,Chla... 在时间相关单光子技术的基础上,对假根羽藻外周天线内叶绿素分子间的能量传递进行研究.采用瞬态吸收与荧光发射谱识别样品内的具有特征光谱组分的分子,得到在叶绿素分子的Q带区主要存在以下六个特征分子Chlb630,Chlb642,Chla665523,Chla666674,Chla667765,680,Chla668823.在630nm的飞秒脉冲光的激发下,通过对不同特征发射峰出的荧光动力学进行解析得到1)Chlb628分子所吸收的能量仅有大约20%被直接传递给其他叶绿素分子,传能时间小于150fs;2)叶绿素间大部分的能量传递发生在长于76ps的时间范围内;3)传能时间常量在几百fs以及10ps左右的间接传能可能与具有不同光谱组分特征的叶绿素分子在外周天线内的排列方式以及偶极距的取向有关;4)Chlb654,657652,Chla666664,Chla667747,680和Chla668823以荧光形势耗散能量的时间常量分别为1.41ns,1.39ns,676ps,709ps,这部分在整个能量耗散中占的比例不超过40%. 展开更多
关键词 能量传递 外周天线 飞秒光谱 荧光动力学
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酞菁锌分子激发态的超快内转换和振动弛豫 被引量:5
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作者 王朝晖 衷庆华 +2 位作者 熊轶嘉 孙亚 孔繁敖 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 1998年第1期15-19,共5页
用飞秒时间分辨荧光亏蚀法研究了四特丁基酞菁(BuPc)、四特丁基酞菁锌(ZnBuPc)和四丙氧基酞菁锌(ZnPrPc)激发态的超快驰豫过程。用波长为398mm和796mm的超短脉冲激光激发分子,观察了S2态到S1态的... 用飞秒时间分辨荧光亏蚀法研究了四特丁基酞菁(BuPc)、四特丁基酞菁锌(ZnBuPc)和四丙氧基酞菁锌(ZnPrPc)激发态的超快驰豫过程。用波长为398mm和796mm的超短脉冲激光激发分子,观察了S2态到S1态的内转换,其特征时间约为30fs。在796mm先于398mm作用于样品分子时,观察到了荧光强度渐变的过程,通过分析认为这一过程反映了S1的振动驰豫。通过对实验数据的拟合,得到了它们的振动驰豫特征时间,BuPc分子为1.5ps,ZnBuPc和ZnBuPc的特征时间分别为13.4和7.6ps。 展开更多
关键词 飞秒时间分辨 酞菁锌 内转换 振动弛豫 激发态
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PSⅡ核心复合物能量传递的飞秒时间分辨荧光光谱学研究 被引量:3
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作者 刘晓 王水才 +2 位作者 贺俊芳 彭菊芳 匡廷云 《生物物理学报》 CAS CSCD 北大核心 2004年第4期290-296,共7页
运用稳态、瞬态荧光光谱技术对光系统Ⅱ核心复合物的能量传递动力学进行研究。分别用436 nm光脉冲激发叶绿素a分子、451 nm光激发叶绿素a和β-胡萝卜素分子、473和481 nm光激发β-胡萝卜素分子,得到5组反应能量传递、电荷重组等过程的... 运用稳态、瞬态荧光光谱技术对光系统Ⅱ核心复合物的能量传递动力学进行研究。分别用436 nm光脉冲激发叶绿素a分子、451 nm光激发叶绿素a和β-胡萝卜素分子、473和481 nm光激发β-胡萝卜素分子,得到5组反应能量传递、电荷重组等过程的寿命组分:8~40 ps为核心天线中β-胡萝卜素分子通过相邻β-胡萝卜素分子或中间叶绿素a向叶绿素a分子传递能量的时间;85~152 ps为核心天线色素分子激发能传递时间;201~925 ps反映部分电荷重组过程;1.031~1.21 ns为参与能量传递的色素分子从激发态衰退回到基态的时间;6.17~18.13 ns的长寿命时间组分归因于P680+Pheo-的重组过程。将荧光发射谱进行高斯解析,发现在核心复合物中还至少存在Chla683685、Chla680682、Chla673,677679三种特征叶绿素a分子。 展开更多
关键词 PSⅡ核心复合物 能量传递 飞秒时间分辨荧光光谱
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飞秒激光与生物细胞作用机理及应用 被引量:3
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作者 狄建科 周明 +1 位作者 杨海峰 戴娟 《激光生物学报》 CAS CSCD 2008年第2期270-277,共8页
飞秒激光是自1960年第一台激光器诞生以来,过去20年间由激光科学发展起来的最强有力的新工具之一。飞秒激光由于脉冲持续时间短、瞬时功率大、聚焦尺寸小的特点,使得其在超快、超强和超精细领域有着广阔的应用前景。其中最重要的一个方... 飞秒激光是自1960年第一台激光器诞生以来,过去20年间由激光科学发展起来的最强有力的新工具之一。飞秒激光由于脉冲持续时间短、瞬时功率大、聚焦尺寸小的特点,使得其在超快、超强和超精细领域有着广阔的应用前景。其中最重要的一个方向是飞秒激光在生物细胞方面的应用。细胞是生命活动的基本单位。所有的病源微观上都体现在细胞中细胞器的工作,所以用飞秒激光作用在病体的细胞器上达到治疗的目的,是一个很有前景的领域。由于生物大分子和水几乎不吸收近红外光,故应用近红外飞秒激光对细胞进行手术,同时可在不损伤细胞活性的前提下对细胞进行实验。这种激光手术技术已被用于对细胞内结构进行切割和蚀除。介绍了该技术在细胞领域中的一些应用,如纳米手术、基因转染和染色体切割等;还介绍了飞秒激光技术与生物细胞中主要细胞器的祛除的原理、飞秒激光细胞操作与手术系统和实验中荧光成像、多光子成像显微镜等手段。 展开更多
关键词 飞秒激光 细胞 纳米手术 荧光技术 多光子成像
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侧链基团对聚合物薄膜瞬态发光性能的影响 被引量:2
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作者 张伟 余汉城 +3 位作者 王惠 林位株 黄锦汪 计亮年 《发光学报》 EI CAS CSCD 北大核心 2007年第4期521-525,共5页
采用飞秒激光光谱技术比较研究了两种卟啉侧链聚合物:卟啉丙烯酸酯-苯乙烯共聚物P[(por)A-S]和卟啉铁(Ⅲ)丙烯酸酯-苯乙烯共聚物P[(por)FeA-S]的瞬态发光性能。并采用纳秒激光光谱技术测量了小分子卟啉(TPP)的荧光动力学过程。结果表明:... 采用飞秒激光光谱技术比较研究了两种卟啉侧链聚合物:卟啉丙烯酸酯-苯乙烯共聚物P[(por)A-S]和卟啉铁(Ⅲ)丙烯酸酯-苯乙烯共聚物P[(por)FeA-S]的瞬态发光性能。并采用纳秒激光光谱技术测量了小分子卟啉(TPP)的荧光动力学过程。结果表明:P[(por)FeA-S]具有比P[(por)A-S]快得多的荧光弛豫过程,而P[(por)A-S]的荧光寿命远小于小分子卟啉的荧光寿命。对上述过程进行了分析,P[(por)A-S]的荧光衰变主要来源于聚合物分子链间的相互作用;而P[(por)FeA-S]的荧光衰变除了来源于聚合物分子链间的相互作用外,中央金属离子与配位体之间的电荷转移也对卟啉发色基团的激发态超快无辐射弛豫具有重要的影响,对上述过程的产生机理进行了讨论。 展开更多
关键词 卟啉侧链聚合物 瞬态荧光动力学 飞秒激光技术
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飞秒激光光谱技术在燃烧领域的应用 被引量:2
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作者 张大源 李博 +1 位作者 高强 李中山 《实验流体力学》 EI CAS CSCD 北大核心 2018年第1期1-10,共10页
基于飞秒激光的燃烧诊断技术,可实现燃烧场温度、速度、组分浓度等参数的在线测量。作为一种有效的诊断工具,飞秒激光诊断技术在燃烧领域中有着广泛的应用前景,将在提高燃烧效率和降低燃烧排放等方面发挥越来越重要的作用。本文通过综... 基于飞秒激光的燃烧诊断技术,可实现燃烧场温度、速度、组分浓度等参数的在线测量。作为一种有效的诊断工具,飞秒激光诊断技术在燃烧领域中有着广泛的应用前景,将在提高燃烧效率和降低燃烧排放等方面发挥越来越重要的作用。本文通过综述飞秒多光子激光诱导荧光技术、飞秒激光成丝诱导非线性光谱技术以及飞秒激光电子激发示踪测速技术等飞秒激光在燃烧领域的具体应用实例,概括介绍了飞秒激光燃烧诊断技术的发展。在此基础上,对飞秒激光燃烧诊断技术在未来的发展潜力进行了分析与讨论,为相关研究人员提供参考。 展开更多
关键词 飞秒激光燃烧诊断技术 飞秒多光子激光诱导荧光 飞秒激光成丝诱导非线性光谱 飞秒激光电子激发示踪测速
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飞秒荧光亏蚀光谱技术研究液相体系取向弛豫 被引量:1
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作者 刘建勇 范文慧 +2 位作者 韩克利 徐大力 楼南泉 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 北大核心 2003年第3期161-162,共2页
Femtosecond time-resolved fluorescence depletion spectroscopy was used in the study of the orientation relaxation of Rhodamine 700(LD700) and Oxazine 750(OX750) in DMSO. The anisotropy functions of the dye molecules w... Femtosecond time-resolved fluorescence depletion spectroscopy was used in the study of the orientation relaxation of Rhodamine 700(LD700) and Oxazine 750(OX750) in DMSO. The anisotropy functions of the dye molecules were obtained from the fluorescence depletion spectra, as the polarization of probe pulse is parallel and perpendicular respectively. The results show that the transition dipole moment of the pump and the probe of LD700 and OX750 are parallel. The time constants of the orientation relaxation of these dye molecules in DMSO are 1.8 and 1.9 ps for LD700 and OX750, respectively. 展开更多
关键词 取向弛豫 激光染料 飞秒激光:荧光亏蚀光谱
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