检索结果-南通市图书馆

A Model on Understanding Atomic Coherence in Lasing Without Inversion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1992年第11期9卷 585-588页

作者： LUO Zhenfei xu zhizhan Institute of Optics and Fine Mechanics Academia SinicaShanghai 201800

A laser model which may operate in the absence of population inversion is *** is found that the realization of lasing without inversion in this model is due to the change of noninversion condition along with the creat... 详细信息

关键词： lasing realization Inversion

Experimental Study on the Properties of Line-Shaped Laser-Plasma

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1994年第5期11卷 277-280页

作者： HAN Shensheng ZHANG Lingqing xu zhizhan ZHANG Zhengquan SUN Lan Shanghai Institute of Optics and Fine Mechanics Academia SinicaShanghai 201800

Line-focused high power laser was used to irradiate a magnesium slab target in order to generate line-shaped *** parameter profile distribution(electron temperature and electron density)on the direction perpendicular to the target surface was obtained by spectroscopic diagnostic method,which is quite different from that of the spot-shaped *** experimental phenomena that can be interpreted as“plasma satellites”were also observed.

关键词： shaped magnesium spectroscopic

Initial Evolution of a Laser Wake-Field in Plasmas

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1993年第1期10卷 25-28页

作者： SHENG Zhengming MA Jinxiu YU Wei xu zhizhan Shanghai Institute of Optics and Fine Mechanics Academia SinicaShanghai 201800

Numerical calculations are used to study the initial temporal evolution of the wake-field produced by a short laser *** are compared to the previous quasi-static *** usually adopted quasi-static approximation is found... 详细信息

关键词： Evolution approximation Plasma

Stable,intense supercontinuum light generation at 1 kHz by electric field assisted femtosecond laser filamentation in air

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第2期13卷 354-365页

作者： Yaoxiang Liu Fukang Yin Tie-Jun Wang Yuxin Leng Ruxin Li zhizhan xu See Leang Chin State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser ScienceChinese Academy of SciencesShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Centre d’Optique Photonique et Laser(COPL)and Département de physiquede génie physique et d’optiqueUniversitéLavalQuébecQuébecCanada

Supercontinuum(SC)light source has advanced ultrafast laser spectroscopy in condensed matter science,biology,physics,and *** to the frequently used photonic crystal fibers and bulk materials,femtosecond laser filamentation in gases is damage-immune for supercontinuum generation.A bottleneck problem is the strong jitters from filament induced self-heating at kHz repetition rate *** demonstrated stable kHz supercontinuum generation directly in air with multiple mJ level pulse *** was achieved by applying an external DC electric field to the air plasma *** pointing jitters of the 1 kHz air filament induced SC light were reduced by more than 2 *** stabilized high repetition rate laser filament offers the opportunity for stable intense SC generation and its applications in air.

关键词： intense repetition light

Phase-matched high-order harmonics by interaction of Ar atoms with high-repetition-rate low-energy femtosecond laser pulses

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2004年第4期47卷 492-501页

作者： XIE Xinhua ZENG Zhinan LI Ruxin CHEN Shu LU Haihe YIN Dingjun xu zhizhan Key Laboratory for High Intensity Optics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China

Phase-matched high-order harmonic generation in Ar gas-filled cell was investigated experimentally. We obtained phase-matched 27th order harmonic driven by a commercially available solid-state femtosecond laser system at 0.55 mJ/pulse energy level and 1 kHz repetition rate. To our knowledge, this is the lowest driving laser energy used to obtain phase-matched 27th order harmonic in a static gas cell. High-order harmonic generation at different gas density was studied systematically. Spectral blueshift and broadening of high harmonics under different pressure were analyzed. We found that the source size and spatial distribution of high-order harmonics are quite different under the phase-matching condition from those of the phase-mismatching case.

关键词： high-order harmonic generation phase matching spectral characteristic spatial distribution

Nonlinear spectral cleaning effect in cross-polarized wave generation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第5期27卷 281-286页

作者： Linpeng Yu Yi xu Fenxiang Wu Xiaojun Yang Zongxin Zhang Yuanfeng Wu Yuxin Leng zhizhan xu State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China

The underlying mechanism of the spectral cleaning effect of the cross-polarized wave（XPW） generation process was theoretically investigated. This study shows that the spectral noise of an input spectrum can be removed in the XPW generation process and that the spectral cleaning effect depends on the characteristics of the input pulses, such as the chirp and Fourier-transform-limited duration of the initial pulse, and the modulation amplitude and frequency of the spectral noise. Though these factors codetermine the output spectrum of the XPW generation process, the spectral cleaning effect is mainly affected by the initial pulse chirp. The smoothing of the spectrum in the XPW generation process leads to a significant enhancement of the coherent contrast.

关键词： nonlinear optics cross-polarized wave generation spectral cleaning effect

Time-Evolution of X-Ray Emission Nonuniformity in Line-Shaped Laser Plasmas

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1995年第10期12卷 601-604页

作者： ZHANG Lingqing HAN Shensheng xu zhizhan ZHANG Zhengquan WANG Xiaofang FAN Pinzhong SONG Xiangyang QIAN Aidi Shanghai Institute of Optics and Fine Mechanics Academia SinicaShanghai 201800

The spatially and time resolved 2D images of x-ray emission of line-shaped Ti laser plasmas have been obtained with a pinhole transmission grating spectrometer coupled with a x-ray streak *** x-ray emission nonuniformity of the plasma is quantitatively analyzed using a perturbation spectrum analysis *** results show that the nonuniformity has a minimum value at a time corresponding to the peak time of the pumping laser pulse,and increases after that.A brief discussion on the nonuniformity mechanism has also been presented.

关键词： pumping Nonuniform spatially

The Electron Trajectory in a Relativistic Femtosecond Laser Pulse

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2005年第4期7卷 2968-2972页

作者： He Feng Yu Wei Lu Peixiang xu Han Shen Baifei Li Ruxin xu zhizhan Shanghai Institute of Optics and Fine Mechanics Shanghai 201800 China State Key Laboratory of Laser Technology Huazhong University of Science and Technology Wuhan 430070China

In this report,we start from Lagrange equation and analyze theoretically the electron dynamics in electromagnetic *** solving the relativistic government equations of electron,the trajectories of an electron in plane laser pulse,focused laser pulse have been given for different initial *** electron trajectory is determined by its initial momentum,the amplitude,spot size and polarization of the laser *** optimum initial momentum of the electron for LSS(laser synchrotron source)is *** polarized laser is more advantaged than circular polarized laser for generating harmonic radiation.

关键词： femtosecond laser pulse electron trajectory Maxwell equation

Inertial confinement fusion driven by long wavelength electromagnetic pulses

在线全文

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2013年第Z1期1卷 105-109页

作者： Baifei Shen xueyan Zhao Longqing Yi Wei Yu zhizhan xu State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

A method for inertial confinement fusion driven by powerful long wavelength electromagnetic pulses(EMPs), such as CO2 laser pulses or high power microwave pulses, is proposed. Due to the high efficiency of generating such long wavelength electromagnetic pulses, this method is especially important for the future fusion electricity power. Special fuel targets are designed to overcome the shortcomings of the long wavelength electromagnetic pulses.

关键词： CO2laser Inertial confinement fusion laser acceleration