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Study on the interaction of intense femtosecond laser pulses with nanometre-sized hydrogen clusters 被引量:1
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作者 郑莉 王成 +4 位作者 李邵辉 刘丙辰 倪国权 李儒新 徐至展 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第4期697-701,共5页
The interaction of intense femtosecond laser pulses with hydrogen clusters has been experimentally studied. The hydrogen clusters were produced from expansion of high-pressure hydrogen gas (backed up to 8×10^6Pa... The interaction of intense femtosecond laser pulses with hydrogen clusters has been experimentally studied. The hydrogen clusters were produced from expansion of high-pressure hydrogen gas (backed up to 8×10^6Pa) into vacuum through a conical nozzle cryogenically cooled by liquid nitrogen. The average size of hydrogen clusters was estimated by Rayleigh scattering measurement and the maximum proton energy of up to 4.2keV has been obtained from the Coulomb explosion of hydrogen clusters under 2 × 10^16W/cm^2 laser irradiation. Dependence of the maximum proton energy on cluster size and laser intensity was investigated, indicating the correlation between the laser intensity and the cluster size. The maximum proton energy is found to be directly proportional to the laser intensity, which is consistent with the theoretical prediction. 展开更多
关键词 PROTONS hydrogen clusters intense femtosecond laser pulse
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Quantum Path Selection and Isolated-Attosecond-Pulse Generation of H2+ with an Intense Laser Pulse and a Static Field 被引量:1
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作者 苗向阳 刘莎莎 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第1期42-46,共5页
We theoretically investigate the high-order-harmonic generation from the H2^+ molecular ion exposed to the combi- nation of an intense trapezoidal laser and a static field. The results show that the harmonic spectrum... We theoretically investigate the high-order-harmonic generation from the H2^+ molecular ion exposed to the combi- nation of an intense trapezoidal laser and a static field. The results show that the harmonic spectrum is obviously extended and the short quantum path is selected to contribute to the spectrum, because the corresponding long path is seriously suppressed. Then the combined Coulomb and laser field potentials and the time-dependent electron wave packet distributions are applied to illustrate the physical mechanism of high-order harmonic gen- eration. Finally, by adjusting the intensity of the static field and superposing a properly selected range of the HHG spectrum, a 90-as isolated attosecond pulse is straightforwardly obtained. 展开更多
关键词 Quantum Path Selection and Isolated-Attosecond-Pulse Generation of H2 with an intense laser Pulse and a Static Field
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Dynamics simulation on the interaction of intense laser pulses with atomic clusters
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作者 杜洪川 朱鹏佳 +4 位作者 孙少华 刘作业 李露 马玲玲 胡碧涛 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第6期2426-2431,共6页
Under classical particle dynamics, the interaction process between intense femtosecond laser pulses and icosahedral noble-gas atomic clusters was studied. Our calculated results show that ionization proceeds mainly th... Under classical particle dynamics, the interaction process between intense femtosecond laser pulses and icosahedral noble-gas atomic clusters was studied. Our calculated results show that ionization proceeds mainly through tunnel ionization in the combined field from ions, electrons and laser, rather than the electron-impact ionization. With increasing cluster size, the average and maximum kinetic energy of the product ion increases. According to our calculation, the expansion process of the clusters after laser irradiation is dominated by Coulomb explosion and the expansion scale increases with increasing cluster size. The dependence of average kinetic energy and average charge state of the product ions on laser wavelength is also presented and discussed. The dependence of average kinetic energy on the number of atoms inside the cluster was studied and compared with the experimental data. Our results agree with the experimental results reasonably well. 展开更多
关键词 intense femtosecond laser pulse Coulomb explosion CLUSTER tunnel ionization
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Nonlinear propagation of an intense Laguerre-Gaussian laser pulse in a plasma channel
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作者 Mingping Liu Zhen Zhang Suhui Deng 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第5期499-506,共8页
The nonlinear propagation of an intense Laguerre-Gaussian(LG)laser pulse in a parabolic preformed plasma channel is analyzed by means of the variational method.The evolution equation of the spot size is derived includ... The nonlinear propagation of an intense Laguerre-Gaussian(LG)laser pulse in a parabolic preformed plasma channel is analyzed by means of the variational method.The evolution equation of the spot size is derived including the effects of relativistic self-focusing,preformed channel focusing,and ponderomotive self-channeling.The parametric conditions of the LG laser pulse and plasma channel for propagating with constant spot size,periodically focusing and defocusing oscillation,catastrophic focusing,and solitary waves are obtained.Compared with the laser pulse with fundamental Gaussian(FG)mode,it is found that the effect of vacuum diffraction is reduced by half and the effects of relativistic and wakefield focusing are decreased by a quarter due to the hollow transverse intensity profile of the LG laser pulse,while the effect of channel focusing is the same order of magnitude with that of the FG laser pulse.Thus,the matched condition for the intense LG laser pulse with constant spot size is released obviously,while the parameters of the laser and plasma for the existence of solitary waves nearly coincide with those of the FG laser pulse. 展开更多
关键词 nonlinear propagation intense Laguerre-Gaussian laser pulse wake-field effect plasma channel
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Stimulated Emission of Gamma Photon from Ultrashort Pulse Intense Laser—Solid—Target Interaction
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作者 LIUShi-Bing XIEBai-Song +3 位作者 ZHUShao-Ping ZHENChun-Yang ZHANGJie ZUOTie-CHuan 《Communications in Theoretical Physics》 SCIE CAS CSCD 2003年第6期737-740,共4页
The efficient production of energetic γ photons is a significant physical process in the relativistic ultrashortpulse laser-plasma inducing photonuclear action. Based on the interaction of laser-solid-target, an anal... The efficient production of energetic γ photons is a significant physical process in the relativistic ultrashortpulse laser-plasma inducing photonuclear action. Based on the interaction of laser-solid-target, an analytical theory onstimulated γ photon emission from a hot electron firing the target-nucleus is developed by a relativistic full quantummethod. The emitting power or probability of γ photon in arbitrary space direction can be calculated for laser irradiatingsolid-target normally. It is valid only if the scatter-centre is immovable or its motion can be neglected compared withthat of the scattered electrons. 展开更多
关键词 emission of gamma photon ultrashort pulse intense laser solid target photon-nuclear radiation
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Coulomb expansion of deuterated methane clusters irradiated by an ultrashort intense laser pulse
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作者 李洪玉 刘建胜 +3 位作者 王成 倪国权 李儒新 徐至展 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第4期1237-1241,共5页
The simulations of three-dimensional particle dynamics show that when irradiated by an ultrashort intense laser pulse, the deuterated methane cluster expands and the majority of deuterons overrun the more slowly expan... The simulations of three-dimensional particle dynamics show that when irradiated by an ultrashort intense laser pulse, the deuterated methane cluster expands and the majority of deuterons overrun the more slowly expanding carbon ions, resulting in the creation of two separated subelusters. The enhanced deuteron kinetic energy and a narrow peak around the energy maximum in the deuteron energy distribution make a considerable contribution to the efficiency of nuclear fusion compared with the ease of homonuelear deuterium clusters. With the intense laser irradiation, the nuclear fusion yield increases with the increase of the cluster size, so that deuterated heteronuelear clusters with larger sizes are required to achieve a greater neutron yield. 展开更多
关键词 deuterated methane cluster ultrashort intense laser pulse Coulomb explosion nuclear fusion
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Self-modulation and anomalous collective scattering of laser produced intense ion beam in plasmas
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作者 K.Mima J.Fuchs +5 位作者 T.Taguchi J.Alvarez J.R.Marques S.N.Chen T.Tajima J.M.Perlado 《Matter and Radiation at Extremes》 SCIE EI CAS 2018年第3期127-134,共8页
The collective interaction between intense ion beams and plasmas is studied by simulations and experiments,where an intense proton beam produced by a short pulse laser is injected into a pre-ionized gas.It is found th... The collective interaction between intense ion beams and plasmas is studied by simulations and experiments,where an intense proton beam produced by a short pulse laser is injected into a pre-ionized gas.It is found that,depending on its current density,collective effects can significantly alter the propagated ion beam and the stopping power.The quantitative agreement that is found between theories and experiments constitutes the first validation of the collective interaction theory.The effects in the interaction between intense ion beams and background gas plasmas are of importance for the design of laser fusion reactors as well as for beam physics. 展开更多
关键词 Two stream instabilities Ultra intense short pulse laser Proton beam Wake field Electron plasma wave laser plasma interaction
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Gravitational Perturbation of Hydrogen Spectrum in the Space Curved by Intense Laser Pulses
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作者 Ji Peiyong Zhu Shitong Shen Wenda 《Advances in Manufacturing》 SCIE CAS 1998年第3期28-33,共6页
The energy level shifts of hydrogen in the space curved by the intense short laser pulses are studied. It shows that for present power level of laser pulses, the magnitude of the energy level shifts in a highly ex... The energy level shifts of hydrogen in the space curved by the intense short laser pulses are studied. It shows that for present power level of laser pulses, the magnitude of the energy level shifts in a highly excited hydrogen atom is detectable. 展开更多
关键词 energy level shifts intense laser pulse general relativity curved spacetime.
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Propagation of Intense Femtosecond Laser Pulses in Deuterated Methane and Deuterium Cluster Jets
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作者 周子理 刘建胜 +7 位作者 卢海洋 鞠晶晶 王成 夏长权 王文涛 邓爱华 许毅 冷雨欣 《Plasma Science and Technology》 SCIE EI CAS CSCD 2011年第1期3-10,共8页
Propagation of intense femtosecond laser pulses (60 fs, 800 nm, 120 m J, 6 × 10^17 W/cm^2 in vacuum) in supersonic (CD4)N and (D2)N cluster jets at different backing pressures was studied. Pump-probe interf... Propagation of intense femtosecond laser pulses (60 fs, 800 nm, 120 m J, 6 × 10^17 W/cm^2 in vacuum) in supersonic (CD4)N and (D2)N cluster jets at different backing pressures was studied. Pump-probe interferometry is employed to investigate the propagation of laser beams in dense cluster jets by examining the electron density distribution of plasma chan- nels. It was found that propagation effects, including ionization-induced defocusing and laser attenuation of incident pulses, are very different in the (CD4)N and (D2)N cluster jets. Different ionization states of CD4 and D2 molecules were observed by analyzing the transverse electron density profiles of the plasma channels and should be considered as a major reason for the differences in the propagation effects. Numerical simulations of the nonlinear propagation of femtosecond laser pulses in (CD4)N and (D2)N cluster jets were performed, and the results indicated a good reproduction of the experimental data. 展开更多
关键词 intense femtosecond laser pulse cluster jet plasma channel ionization- induced defocusing
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Modulation of ionization on laser frequency in ultra-short pulse intense laser-gas-target
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作者 胡强林 刘世炳 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第10期2357-2362,共6页
Based on the dispersion relation of intense laser pulse propagating in gradually ionized plasma, this paper discusses the frequency modulation induced by ionization of an ultra-short intense laser pulse interacting wi... Based on the dispersion relation of intense laser pulse propagating in gradually ionized plasma, this paper discusses the frequency modulation induced by ionization of an ultra-short intense laser pulse interacting with a gas target. The relationship between the frequency modulation and the ionization rate, the plasmas frequency variation, and the polarization of atoms (ions) is analysed. The numerical results indicate that, at high frequency, the polarization of atoms (ions) plays a more important role than plasma frequency variation in modulating the laser frequency, and the laser frequency variation is different at different positions of the laser pulse. 展开更多
关键词 intense laser pulse tunnelling ionization partially stripped plasma
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Ultrafast photoionization of ions and molecules by orthogonally polarized intense laser pulses: Effects of the time delay
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作者 Si-Qi Zhang Zhi-Jie Yang +5 位作者 Zhi-Xian Lei Wei Feng Sheng-Peng Zhou Kai-Jun Yuan Xue-Shen Liu Jing Guo 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第1期207-214,共8页
We present the photoelectron momentum distributions(PMDs) and the photoelectron angular distributions(PADs) of He+ ions, aligned H2+ molecules and N2 molecules by intense orthogonally polarized laser pulses. Simulatio... We present the photoelectron momentum distributions(PMDs) and the photoelectron angular distributions(PADs) of He+ ions, aligned H2+ molecules and N2 molecules by intense orthogonally polarized laser pulses. Simulations are performed by numerically solving the corresponding two-dimensional time-dependent Schr?dinger equations(TDSEs) within the single-electron approximation frame. Photoelectron momentum distributions and photoelectron angular distributions present different patterns with the time delays Td, illustrating the dependences of the PMDs and PADs on the time delays by orthogonally polarized laser pulses. The evolution of the electron wavepackets can be employed to describe the intensity of the PADs from the TDSE simulations for N2 molecules. 展开更多
关键词 photoelectron momentum distributions photoelectron angular distributions intense orthogonally polarized laser pulses ultrafast photoionization model
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Effect of laser spot size on fusion neutron yield in laser-deuterium cluster interactions 被引量:1
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作者 陈光龙 卢海洋 +4 位作者 王成 刘建胜 李儒新 倪国权 徐至展 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第6期2124-2129,共6页
The effect of the laser spot size on the neutron yield of table-top nuclear fusion from explosions of a femtosecond intense laser pulse heated deuterium clusters is investigated by using a simplified model, in which t... The effect of the laser spot size on the neutron yield of table-top nuclear fusion from explosions of a femtosecond intense laser pulse heated deuterium clusters is investigated by using a simplified model, in which the cluster size distribution and the energy attenuation of the laser as it propagates through the cluster jet are taken into account. It has been found that there exists a proper laser spot size for the maximum fusion neutron yield for a given laser pulse and a specific deuterium gas cluster jet. The proper spot size, which is dependent on the laser parameters and the cluster jet parameters, has been calculated and compared with the available experimental data. A reasonable agreement between the calculated results and the published experimental results is found. 展开更多
关键词 CLUSTERS femtosecond intense laser pulse table-top laser driven nuclear fusion
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Forward acceleration and generation of femtosecond megaelectronvolt electron beams by an ultrafast intense laser pulse
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作者 王晓方 汪权东 沈百飞 《Chinese Optics Letters》 SCIE EI CAS CSCD 2003年第1期50-52,共3页
We present a new mechanism of energy gain of electrons accelerated by a laser pulse. It is shown that when the intensity of an Tiltrafast intense laser pulse decreases rapidly along the direction of propagation, elect... We present a new mechanism of energy gain of electrons accelerated by a laser pulse. It is shown that when the intensity of an Tiltrafast intense laser pulse decreases rapidly along the direction of propagation, electrons leaving the pulse experience an action of ponderomotive deceleration at the descending part of a lower-intensity laser field than acceleration at the ascending part of a high-intensity field, thus gain net energy from the pulse and move directly forward. By means of such a mechanism, a megaelectronvolt electron beam with a bunch length shorter than 100 fs could be realized with an ultrafast (≤30 fs), intense (≥1019 W/cm2) laser pulse. 展开更多
关键词 of as in is Forward acceleration and generation of femtosecond megaelectronvolt electron beams by an ultrafast intense laser pulse that by FWHM net
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Effects of Higher-Order Relativistic Nonlinearity and Wakefield During a Moderately Intense Laser Pulse Propagation in a Plasma Channel
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作者 刘明萍 刘兵兵 +2 位作者 刘三秋 张福阳 刘杰 《Communications in Theoretical Physics》 SCIE CAS CSCD 2013年第8期222-226,共5页
Using a variational approach,the propagation of a moderately intense laser pulse in a parabolic preformed plasma channel is investigated.The effects of higher-order relativistic nonlinearity (HRN) and wakefield are in... Using a variational approach,the propagation of a moderately intense laser pulse in a parabolic preformed plasma channel is investigated.The effects of higher-order relativistic nonlinearity (HRN) and wakefield are included.The effect of HRN serves as an additional defocusing mechanism and has the same order of magnitude in the spot size as that of the transverse wakefield (TWF).The effect of longitudinal wakefield is much larger than those of HRN and TWF for an intense laser pulse with the pulse length equaling the plasma wavelength.The catastrophic focusing of the laser spot size would be prevented in the present of HRN and then it varies with periodic focusing oscillations. 展开更多
关键词 higher-order relativistic nonlinearity laser wakefield plasma channel intense laser pulse
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Strong terahertz bursts driven by intense fem to second laser pulses
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《Science Foundation in China》 CAS 2016年第4期27-27,共1页
With the support by the National Natural Science Foundation of China and the Ministry of Science and Technology of China,Prof.Li Yutong(李玉同)at the Institute of Physics,Chinese Academy of Sciences,in collaboration w... With the support by the National Natural Science Foundation of China and the Ministry of Science and Technology of China,Prof.Li Yutong(李玉同)at the Institute of Physics,Chinese Academy of Sciences,in collaboration with Prof.Zhang Jie(张杰)and Sheng Zhengming(盛政明)at Shanghai Jiao Tong University,demonstrated the generation of high-energy,coherent terahertz(THz)radiation from ultra in- 展开更多
关键词 THz Strong terahertz bursts driven by intense fem to second laser pulses
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