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Ultrafast dynamical process of Ge irradiated by the femtosecond laser pulses

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High Power Laser Science and Engineering 2016年第2期4卷 5-13页

作者： Fangjian Zhang Shuchang Li Anmin Chen Yuanfei Jiang Suyu Li mingxing jin Institute of Atomic and Molecular Physics Jilin University Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy(Jilin University)

The ultrafast dynamic process in semiconductor Ge irradiated by the femtosecond laser pulses is numerically simulated on the basis of van Driel system. It is found that with the increase of depth, the carrier density and lattice temperature decrease, while the carrier temperature first increases and then drops. The laser fluence has a great influence on the ultrafast dynamical process in Ge. As the laser fluence remains a constant value, though the overall evolution of the carrier density and lattice temperature is almost independent of pulse duration and laser intensity, increasing the laser intensity will be more effective than increasing the pulse duration in the generation of carriers. Irradiating the Ge sample by the femtosecond double pulses, the ultrafast dynamical process of semiconductor can be affected by the temporal interval between the double pulses.

关键词： carrier energy transfer femtosecond laser lattice semiconductor

Influence of target temperature on femtosecond laser-ablated brass plasma spectroscopy

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Plasma Science and Technology 2020年第7期22卷 4-10页

作者： Junfeng SHAO jin GUO Qiuyun WANG Anmin CHEN mingxing jin Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012People's Republic of China Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy(Jilin University) Changchun 130012People’s Republic of China

Spectral intensity,electron temperature and density of laser-induced plasma(LIP) are important parameters for affecting sensitivity of laser-induced breakdown spectroscopy(LIBS).Increasing target temperature is an easy and feasible method to improve the *** this paper,a brass target in a temperature range from 25℃ to 200℃ was ablated to generate the LIP using femtosecond ***-resolved spectral emission of the femtosecond LIBS was measured under different target *** results showed that,compared with the experimental condition of 25℃,the spectral intensity of the femtosecond LIP was enhanced with more temperature *** addition,the electron temperature and density were calculated by Boltzmann equation and Stark broadening,indicating that the changes in the electron temperature and density of femtosecond LIP with the increase of the target temperature were different from each *** increasing the target temperature,the electron temperature increased while the electron density ***,in femtosecond LIBS,a hightemperature and low-density plasma with high emission can be generated by increasing the target *** increase in the target temperature can improve the resolution and sensitivity of femtosecond LIBS.

关键词： laser-induced breakdown spectroscopy time-resolved spectroscopy emission enhancement femtosecond laser target temperature

Two-Photon Laser Spectroscopy of Autoionizing Rydberg Series of Atomic Tin

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Chinese Physics Letters 1992年第12期9卷 643-646页

作者： jin mingxing DING Dajun LIU Hang PAN Shoufu Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130023

Extensive new data on the even-parity autoionization Rydberg series of neutral-tin have been observed and identified by using two-photon resonant ionization laser spectroscopy and time-of-flight detection *** autoionization Rydberg series are 5pnp(3/2,1/2)_(1,2),5pnp(3/2,3/2)_(1,2,3),5pnf3/2[5/2]_(2,3),5pnp3/2[7/2]_(3,4),and 5pnf3/2[3/2]_(1,2).The second ionization limit I2 is obtained by fitting experimental data with the Rydberg *** is 63483.90±1.35cm^(-1).

关键词： method formula Rydberg

Energy transmittance of focused femtosecond pulses at different air pressures

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Optoelectronics Letters 2023年第10期19卷 605-613页

作者： LI Suyu YU Miao CAI Xiaoming ZHANG He jin mingxing WU Jiabin Institute of Atomic and Molecular Physics Jilin UniversityChangchun130012China Research Center for Intelligent Transportation Zhejiang LabHangzhou311121China State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai201800China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun130033China

Transmission of intense femtosecond laser pulses in air is accompanied by energy *** measuring the transmitted spectra of the focused femtosecond pulses in air,we study the influence of air pressure and initial pulse energy on the spectra around the central wavelength(800 nm)after the interaction of the focused femtosecond laser with *** this basis,the energy transmittance of the central wavelength of the femtosecond pulses is *** is found that as the air pressure is lower than 1 kPa,the transmitted spectra of focused femtosecond pulses change with the pressure,but there is almost no energy depletion,while as the air pressure is higher than 1 kPa,femtosecond filamentation occurs and the energy transmittance of the central wavelength of the femtosecond pulses decreases with the increase of air pressure and pulse *** to the different regimes(i.e.,nonfilamentation,and filamentation regimes),we discuss the effect of energy conversion and transfer on the energy *** work can help to understand the energy depletion during the transmission of ultrashort intense laser pulses in air and provide a guidance for the practical applications of femtosecond filamentation.

关键词： femtosecond pulse laser

Influence of target temperature on AlO emission of femtosecond laser-induced Al plasmas

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Plasma Science and Technology 2021年第4期23卷 55-62页

作者： Wei QI Qiuyun WANG Junfeng SHAO Anmin CHEN mingxing jin Beijing Institute of Tracking and Telecommunications Technology Beijing 100094People’s Republic of China Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012People’s Republic of China State Key Laboratory of Laser Interaction With Matter&Innovation Laboratory of Electro-Optical Countermeasures Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033People’s Republic of China

The influence of the target temperature on the molecular emission of femtosecond laser-induced breakdown spectroscopy(LIBS) was investigated experimentally. An Al target was ablated to produce laser-induced plasma. The Al target was uniformly heated to a maximum of 250℃. The measured molecular emission was AlO(△ν=0) from the femtosecond LIBS of the Al *** measurements indicated that the molecular emission of AlO increased as the temperature of the Al target increased. In addition, a two-temperature model was used to simulate the evolution of the electron and lattice temperature of the Al target with different initial temperatures. The simulated results showed that the electron and lattice temperatures of Al irradiated by the femtosecond laser increased as the initial temperature of the Al target increased;also, the simulated ablated depth increased. Therefore, an increase in the initial Al target temperature resulted in an enhancement in the spectral signal of AlO from the femtosecond LIBS of Al,which was directly related to the increase in the size of the ablated crater. The study suggested that increasing the temperature of the target improves the intensity of molecular emission in femtosecond LIBS.

关键词： laser-induced breakdown spectroscopy femtosecond laser sample temperature AlO

Effect of distances between lens and sample surface on laser-induced breakdown spectroscopy with spatial confinement

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Plasma Science and Technology 2018年第8期20卷 74-81页

作者： Zhenhua JIANG Junfeng SHAO Tingfeng WANG jin GUO Dan ZHANG Anmin CHEN mingxing jin State Key Laboratory of Laser Interaction with Matter ＆ Innovation Laboratory of Electro-Optical Countermeasures Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033People＇s Republic of China Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012People＇s Republic of China Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy Jilin UniversityChangchun 130012People＇s Republic of China

Spatial confinement can significantly enhance the spectral intensity of laser-induced plasma in air. It is attributed to the compression of plasma plume by the reflected shockwave. In addition,optical emission spectroscopy of laser-induced plasma can also be affected by the distance between lens and sample surface. In order to obtain the optimized spectral intensity, the distance must be considered. In this work, spatially confined laser-induced silicon plasma by using a Nd：YAG nanosecond laser at different distances between lens and sample surface was *** laser energies were 12 mJ, 16 mJ, 20 mJ, and 24 mJ. All experiments were carried out in an atmospheric environment. The results indicated that the intensity of Si（I） 390.55 nm line firstly rose and then dropped with the increase of lens-to-sample distance. Moreover, the spectral peak intensity with spatial confinement was higher than that without spatial confinement. The enhancement ratio was approximately 2 when laser energy was 24 mJ.

关键词： laser-induced breakdown spectroscopy LIBS spatial confinement distance of lens- to-sample signal enhancement

Evaporation-induced Morphology Pattern of Triblock Copolymer A5B10C5 in Thin Film： a Multibody DPD Simulation Study

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Chemical Research in Chinese Universities 2014年第1期30卷 144-148页

作者： LI Yang WANG Dequan WANG Wei LI Yanchun HUANG Xuri SUN Chiachung jin mingxing State Key Laboratory of Theoretical and Computational Chemistry Institute of Theoretical Chemistry Jilin University Changchun 130021 P. R. China Institute of Atomic and Molecular Physics Jilin University Changchun 130012 P. R. China

We used multibody dissipative particle dynamics method,by which the attractive and repulsive interactions can be effectively considered,to investigate the evaporation-induced morphology patterns of triblock copolymer A5B10C5 in thin *** changing attractive interactions between solvent vapor and triblock copolymer that represent various selective solvents,lamellar morphology,sandwich lamellar morphology,spherical morphology and disorder morphology patterns of the thin films were obtained for both coil-coil-coil and rod-coil-coil chain architectures,*** order parameter and the film thickness were calculated during the process for characterizing the film properties,and it was found that the rigid A-block of the triblock copolymer hinders the formation of an ordered structure.

关键词： Multibody dissipative particle dynamics Evaporation-induced Morphology pattern Thin film

ANGULAR DISTRIBUTION OF PHOTOELECTRONS IN NON-RESONANT MULTIPHOTON IONIZATION OF ATOMIC LEAD

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Chinese Physics Letters 1989年第3期6卷 126-129页

作者： DING Dajun jin mingxing LIU Hang K.T.Lu Institute of Atomic and Molecular Physics Jilin UniversityChangchun

Non-resonant multiphoton ionization of atomic lead at 1064nm laser field has been *** the angular distribution and the intensity dependence of photoelectrons have been *** results show that they are very sensitive to ... 详细信息

关键词： resonant photoelectron angular

Time-resolved spectroscopy of collinear femtosecond and nanosecond dual-pulse laser-induced Cu plasmas

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Plasma Science and Technology 2021年第11期23卷 121-127页

作者： Qiuyun WANG Hongxia QI Xiangyu ZENG Anmin CHEN Xun GAO mingxing jin Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012People's Republic of China School of Science Changchun University of Science and TechnologyChangchun 130022People's Republic of China

In this paper,we investigate the time-resolved spectroscopy of collinear femtosecond(fs)and nanosecond(ns)dual-pulse(DP)laser-induced plasmas.A copper target was used as an experimental sample,and the fs laser was considered as the time zero reference *** interpulse delay between fs and ns laser beams was 3μ***,we compared the time-resolved peak intensities of Cu(I)lines from Cu plasmas induced by fs+ns and ns+fs DP lasers with collinear *** results showed that compared with the ns+fs DP,the fs+ns DP laser-induced Cu plasmas had stronger peak intensities and longer ***,we calculated time-resolved plasma temperatures using the Boltzmann plot with three spectral lines at Cu(I)510.55,515.32 and 521.82 *** addition,time-resolved electron densities were calculated based on Stark broadening with Cu(I)line at 521.82 *** was found that compared with ns+fs DP,the plasma temperatures and electron densities of the Cu plasmas induced by fs+ns DP laser were ***,we observed images of ablation craters under the two experimental conditions and found that the fs+ns DP laser-produced stronger ablation,which corresponded to stronger plasma emission.

关键词： laser-induced breakdown spectroscopy fs+ns and ns+fs dual-pulse time-resolved spectroscopy plasma temperature electron density