TN247 2005021017 基于单片机的激光远场光斑直接测量系统=Monolithic computer-based energy distribution direct measurement system of laser spot in field[刊,中]／朱震(中国人民解放 军63880部队．河南,洛阳(471003)),姚梅…//...TN247 2005021017 基于单片机的激光远场光斑直接测量系统=Monolithic computer-based energy distribution direct measurement system of laser spot in field[刊,中]／朱震(中国人民解放 军63880部队．河南,洛阳(471003)),姚梅…//光电技术 应用．-2004,19(5)．-28—32 通过比较激光光斑远场直接测量与间接测量的优缺 点,提出使用单片机控制的探测器阵列进行远场光斑直接 测量。描述了系统结构,分析了关键技术,给出了主要程 序的框图。该系统能够测量激光光斑大小、形状、总能量、展开更多
Following Jaynes-Cummings model,the evolution of the field entropy in the system of a two-level atom interacting with the single mode coherent field is investigated under rotating-wave approximation.The typical case &...Following Jaynes-Cummings model,the evolution of the field entropy in the system of a two-level atom interacting with the single mode coherent field is investigated under rotating-wave approximation.The typical case "the field frequency variance with time in the form of sine ω=ω0+usin(wt) has been considered.The influences of the amplitude and angle frequency of the field frequency variance on entropy evolution of the field are discussed by numerical calculations.Calculation results indicate that the field frequency variance influences violently the behavior of field entropy evolution;the larger the amplitude of the field frequency variance is,the stronger the influence of the field frequency variance on the time evolution of field entropy is.展开更多
The ability to generate stable and coherent short wavelength radiation is a great promise of the externally seeded free-electron laser. However, the fre- quency up-conversion efficiency is limited to a small number in...The ability to generate stable and coherent short wavelength radiation is a great promise of the externally seeded free-electron laser. However, the fre- quency up-conversion efficiency is limited to a small number in a single stage setup. In this paper, we propose a new scheme to produce coherent hard X-ray FEL with two- beam based two-stage echo-enabled harmonic generation configuration. Electron beams with quite different proper- ties are separately used in each stage and a monochromator is adopted to purify the radiation from first stage for seeding the second stage. Three-dimensional start-to-end simulations have been performed with realistic parameters to show the feasibility of the proposed scheme.展开更多
文摘TN247 2005021017 基于单片机的激光远场光斑直接测量系统=Monolithic computer-based energy distribution direct measurement system of laser spot in field[刊,中]／朱震(中国人民解放 军63880部队．河南,洛阳(471003)),姚梅…//光电技术 应用．-2004,19(5)．-28—32 通过比较激光光斑远场直接测量与间接测量的优缺 点,提出使用单片机控制的探测器阵列进行远场光斑直接 测量。描述了系统结构,分析了关键技术,给出了主要程 序的框图。该系统能够测量激光光斑大小、形状、总能量、
基金Natural Science Foundation of Fujian Province under Grant(No.2008J0217)
文摘Following Jaynes-Cummings model,the evolution of the field entropy in the system of a two-level atom interacting with the single mode coherent field is investigated under rotating-wave approximation.The typical case "the field frequency variance with time in the form of sine ω=ω0+usin(wt) has been considered.The influences of the amplitude and angle frequency of the field frequency variance on entropy evolution of the field are discussed by numerical calculations.Calculation results indicate that the field frequency variance influences violently the behavior of field entropy evolution;the larger the amplitude of the field frequency variance is,the stronger the influence of the field frequency variance on the time evolution of field entropy is.
基金supported by the National Development and Reform Commission([2013]2347)National Natural Science Foundation of China(11475250)the Shanghai Natural Science Foundation(13ZR1464700)
文摘The ability to generate stable and coherent short wavelength radiation is a great promise of the externally seeded free-electron laser. However, the fre- quency up-conversion efficiency is limited to a small number in a single stage setup. In this paper, we propose a new scheme to produce coherent hard X-ray FEL with two- beam based two-stage echo-enabled harmonic generation configuration. Electron beams with quite different proper- ties are separately used in each stage and a monochromator is adopted to purify the radiation from first stage for seeding the second stage. Three-dimensional start-to-end simulations have been performed with realistic parameters to show the feasibility of the proposed scheme.
