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Supercontinuum Generation in Atmospheric-Pressure Nitrogen Using a Tightly Focused Intense Femtosecond Laser Beam

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Chinese Physics Letters 2000年第6期17卷 413-415页

作者： qiN Yuan-Dong ZHU Chang-Jun YANG Hong gong qi-huang Department of Physics Mesoscopic Physics LaboratoryPeking UniversityBeijing 100871

Supercontinuum generation in atmospheric-pressure nitrogen by a focused intense femtosecond Ti:sapphire laser was studied at various pulse durations and *** generated supercontinuum was greatly blue-broadened due to self-phase modulation in the plasma *** measured blue-broadening△ωis proportional to pulse intensity for fixed pulse duration,and values up to 0.7ω(ωbeing the originaI laser frequency)was obtained with a pulse energy of 9.5 mJ and minimum duration of 100 fs.

关键词： Focus pulse Femto

Ultrafast Third-Order Optical Nonlinearity of Organic Solvents Investigated by Subpicosecond Transient Optical Kerr Effect

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Chinese Physics Letters 1998年第1期15卷 30-31页

作者： gong qi-huang LI Jian-liang ZHANG Tie-qiao YANG Hong Department of Physics Mesoscopic Physics LaboratoryPeking UniversityBeijing 100871

A femtosecond optical Kerr effect experiment has been used to study the dynamic process of third-order optical nonlinearity for organic solvents acetone,acetonitrile,alcohol,benzene,chloroform,dichlomathane,dimenthyl-sulfoxande,dioxane,ethanol,and methanol,*** nonlinear refractive index for the solvents at femtosecond time scale was measured.

关键词： methanol nonlinearity acetonitrile

Ultrafast Dynamics of Polythiophene with Phenyl Vinylene Branches Studied by Femtosecond Fluorescence Spectroscopy in Solution

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Chinese Physics Letters 2011年第11期28卷 228-231页

作者： CHU Sai-Sai GAO Chao WANG Shu-Feng gong qi-huang State Key Laboratory for Mesoscopic Physics Department of PhysicsPeking UniversityBeijing 100871 Xi’an Modern Chemistry Research Institute Xi’an 710065

Two polythiophene based polymers,poly[(3-[2-[4-(2-ethyl-hexyloxy)-phenyl]-vinyl]-thiophene)-co-thiophene](PT1)and poly(3-[2-[4-(2-ethyl-hexyloxy)-phenyl]-vinyl]-thiophene)(PT2),are synthesized and investigated by static,picosecond fluorescence spectroscopies and the femtosecond up-conversion technique in *** with pristine poly(3-hexylthiophene)(P3HT),PT1 and PT2,in which the main chains are decorated with phenyl vinylene present a‘camel back’structure in the absorption *** vinylene side chains induce a new process of charge transfer,chain twisting motion and defect-induced fluorescence quenching at time scales of 1 ps,10 ps and 150 ps,respectively.

关键词： solution spectra vinyl

Spectral and Temporal Properties of Femtosecond White-Light Continuum Generated in H_(2)O

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Chinese Physics Letters 2001年第3期18卷 390-392页

作者： qiN Yuan-Dong WANG Dan-Ling WANG Shu-Feng gong qi-huang Department of Physics and National Laboratory for Mesoscopic Physics Peking UniversityBeijing 100871

The temporal behaviour and spectral distribution of white-light continuum generation in H2O using a focused intense 800 nm 130 fs Ti:Sapphire laser were *** results indicated that the white-light continuum spectrally ranged from 1000 to 400 nm,which was mainly attributed to self-phase modulation related to Kerr effect and *** pulse duration of different spectral components of the generated white-light continuum,which was measured with frequency up-conversion technique,was obtained around 137 *** revealed a comparable time resolution as the original laser pulse.

关键词： Femto white spectral

Static and Ultrafast Transient Photophysics of Mono- and Dual-Branched Triarylamines

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Chinese Physics Letters 2010年第6期27卷 246-249页

作者： LI Feng-Ming MENG Fan-Shun FENG Wen-Ke WANG Shu-Feng TIAN He gong qi-huang State Key Laboratory for Mesoscopic Physics and Department of Physics Peking University Beijing 100871 Labs for Advanced Materials and Institute of Fine Chemicals East China University of Science and Technology Shanghai 200237

Mono- and dual-branched molecules, { 4-[2-（4-benzothiazol-2-yl-phenyl）-vinyl]-phenyl}-（4-methoxy-phenyl）-phenyl- amine （BS1） and bis-{4-[2- （4-benzothiazol-2-yl-phenyl）-vinyI]-phenyl}-（4-methoxy-phenyI）-phenyl-amine （BS2）, are investigated with one- and two-photon static spectroscopy, and the femtosecond fluorescence up-conversion technique. The molecules show branch-based fluorescence emission at low quantum yield. U1trafast non-radiative decay on a picosecond time scale is found and is attributed to intramolecular charge-transfer bridged by the central triphenylamine. The two-photon absorption cross-sections of BS1 and BS2 are 19.1 and 19.4 GM, respectively.

关键词： PICOSECOND pulses TRANSIENTS (Dynamics) AMINES FEMTOCHEMISTRY QUANTUM chemistry RADIOACTIVE decay CROSS sections (Nuclear physics) CHARGE transfer FLUORESCENCE spectroscopy

Sub-diffraction-Limit Voids in Bulk Quartz Induced by Femtosecond Laser Pulses

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Chinese Physics Letters 2001年第1期18卷 65-67页

作者： WANG Dan-Ling LI Cheng-De LUO Le YANG Hong gong qi-huang National Laboratory for Mesoscopic Physics and Department of Physics Peking UniversityBeijing 100871

When a powerful femtosecond laser pulse was tightly focused into a bulk quartz,plasma generation occurred only in a very small focal *** extremely confined interaction led to an explosive expansion and generated a sub-micrometre void with a diameter as small as *** dependence of the size of the void on the laser energy or pulse duration was investigated and the mechanism of this process was associated dominantly with the multiphoton ionization.

关键词： Femto pulse Quartz

Plasma Generation in Air by Intense Laser Pulses with Various Pulse Durations

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Chinese Physics Letters 1999年第8期16卷 580-582页

作者： qiN Yuan-dong YANG Hong WANG Shu-feng ZHU Chang-jun gong qi-huang Department of Physics Mesoscopic Physics LaboratoryPeking UniversityBeijing 100871

We have studied the plasma generation through collecting the charged particles produced in laser-induced break-down in atmospheric *** breakdovn is produced by ultrashort laser pulses with various durations ranging from 200fs to 2ps at a fixed pulse energy of *** found that the plasma yield increases first with the increment of pulse duration and then reaches a plateau at a duration longer than *** generated plasma temperature is estimated to be higher than 5x 10^(5)K.

关键词： pulse laser ultrashort

Third-Order Harmonic Generation in Atmospheric Air with Focused Intense Femtosecond Laser Pulses

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Chinese Physics Letters 2001年第1期18卷 57-59页

作者： ZHU Chang-Jun qiN Yuan-Dong YANG Hong WANG Shu-Feng gong qi-huang National Laboratory for Mesoscopiof Physics and Department of Physics Peking University Beijing 100871 Institute of Physics Chinese Academy of SciencesBeijing 100080

Generation of third-order harmonics at 800 nm of femtosecond laser pulses is studied in neutral atmospheric air and in plasma of optical breakdown in *** efficiency is measured at different fundamental laser intensities.A maximum efficiency is observed at the intensity when optical breakdown in atmospheric air *** factors that exhibit the main effects on the harmonic generation,including self-focusing in a neutral air and self-focusing in plasma,are discussed.

关键词： breakdown Focus Femto

Optical Limiting Performance of a Crystal Violet Cation Fulleride Salt

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Chinese Physics Letters 2001年第8期18卷 1078-1080页

作者： LIU Chun-Ling gong qi-huang CHEN Yi-Xian CHEN Hui-Ying IANG Di Department of Physics and State Key Laboratory for Mesoscopic Physics Peking UniversityBeijing 100871 Department of Chemistry Peking UniversityBeijing 100871

Optical limiting properties of a crystal violet cation fulleride salt dissolved in tetrahydrofuran have been studied by using 10 ns,532 nm laser *** fluence-dependent transmissivity measurements were performed on the samples with the same concentration and different path lengths in a collimated optical *** comparison,the fluence-dependent transmissivities of fullerene C_(60) and crystal violet solutions were also measured under the same linear *** nonlinear optical limiting effect of the fulleride salt in tetrahydrofuran was even slightly stronger than that of C_(60) in toluene.

关键词： limiting violet crystal