oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
A theoretical study about the chirped pulse amplification laser
A Theoretical Study about the chirped pulse amplification laser

Lu Xing-Qiang,Fan Dian-Yuan,
卢兴强
,范滇元

中国物理 B , 2003,
Abstract: Starting from the Maxwell's equation, and using the resonant-dipole equation together with the multilevel rate equations which take the effects of energy relaxation into consideration, we have derived a more realistic numerical model of the chirped pulse amplification for an ultra-broad band width laser amplifier. Numerical simulations of this model show that both the intensity profile and the energy fluence of the amplified chirped pulse are closely connected with the two relaxation effects: the relaxation of the thermalization among the components of the laser multiplets and the depletion of the lower laser level. The results are valuable for the design of ultra-broad bandwidth chirped pulse amplification lasers.
Coherent population transfer in Rydberg potassium atom by a single frequency-chirped laser pulse
Zhang Xian-Zhou,Ma Qiao-Zhi,Li Xiao-Hong,
张现周
,马巧枝,李小红

中国物理 B , 2006,
Abstract: By using the time-dependent multilevel approach, we have calculated the coherent population transfer among the quantum states of potassium atom by a single frequency-chirped laser pulse. The results show that the population can be efficiently transferred to a target state and be trapped there by using an `intuitive' or a `counter-intuitive' frequency sweep laser pulse in the case of `narrowband' frequency-chirped laser pulse. It is also found that a pair of sequential `broadband' frequency-chirped laser pulses can efficiently transfer population from one ground state of the \La atom to the other one.
Electron laser acceleration in vacuum by a quadratically chirped laser pulse  [PDF]
Yousef I. Salamin,Najeh M. Jisrawi
Physics , 2013, DOI: 10.1088/0953-4075/47/2/025601
Abstract: Single MeV electrons subjected in vacuum to single high-intensity quadratically-chirped laser pulses are shown to gain multi-GeV energies. The laser pulses are modeled by finite-duration trapezoidal and $\cos^2$ pulse-shapes and the equations of motion are solved numerically. It is found that, typically, the maximum energy gain from interaction with a quadratic chirp is about half of what would be gained from a linear chirp.
Enhancement of Electron Bunch Acceleration by the Wakefield Generated with Periodical Chirped Laser Pulse in under Dense Plasma  [cached]
Mehdi Asri,Azadeh Ahmadian
Applied Physics Research , 2012, DOI: 10.5539/apr.v4n4p35
Abstract: This paper presents a two dimensional analytical model for a linear laser wakefield generation by the chirped laser pulse and electron bunch acceleration has been studied numerically. It is found that the negative periodical chirp leads to increase the longitudinal and transverse components of the wakefield amplitude by one order of magnitude. In this status, we inject an electron bunch with the initial energy of about 2MeV in front of the periodical chirped laser pulse and we saw the final energy of the trapped electrons arrive to about 0.9Gev in 17mm of plasma length, with an energy spread about 1% and a the emmitance of the order of 0.12 mm mrad.
Electron Acceleration by a Bichromatic Chirped Laser Pulse in Underdense Plasmas  [PDF]
Mihály András Pocsai,Imre Ferenc Barna,Sándor Varró
Physics , 2015, DOI: 10.1016/j.nimb.2015.10.013
Abstract: A theoretical study of laser and plasma based electron acceleration is presented. An effective model has been used, in which the presence of an underdense plasma has been taken account via its index of refraction $n_{m}$. In the confines of this model, the basic phenomena can be studied by numerically solving the classical relativistic equations of motion. The key idea of this paper is the application of chirped, bichromatic laser fields. We investigated the advantages and disadvantages of mixing the second harmonic to the original $\lambda = 800 \, \mathrm{nm}$ wavelength pulse. We performed calculations both for plane wave and Gaussian pulses.
Sub-50 attosecond pulse generation from multicycle nonlinear chirped pulses  [PDF]
Yang Xiang,Yueping Niu,Yihong Qi,Shangqing Gong
Physics , 2009,
Abstract: We present a method of producing single attosecond pulses by high-order harmonic generation with multi-cycle nonlinear chirped driver laser pulses. The symmetry of the laser feld in several optical cycles near the pulse center is dramatically broken, and then the photons which cover a much broad spectrum burst almost only in one optical cycle. So an ultra-broad continuum spectrum appears in the high order harmonic spectrum, from which an isolated sub-50 attosecond pulse could be obtained. The results are almost independent of the length and chirp form of the driver laser pulse.
Control of Superfluorescence for the Optical Parametric Chirped Pulse Amplifier Based on Fiber Laser
光纤激光器光参量啁啾脉冲放大现象

LI Xiao-li,SHI Shun-xiang,LIU Hong-jun,WANG Hong-ying,ZHAO Wei,
李晓莉
,石顺祥,刘红军,王红英,赵卫

光子学报 , 2008,
Abstract: By using a novel double-pass optical parametric chirped pulse amplifier in a single nonlinear crystal,control of the superfluorescence was studied for the optical parametric chirped pulse amplifier based on fiber laser. Net saturated gain of 2×106 has been achieved and the superfluorescence is obviously decreased to less than 1% of the total output pulse energy when the signal is amplified to 2 mJ with rms fluctuations of less than 3% which is saturated after the amplifier. By this scheme, the superfluorescence is effectivly constrained and the stability of the signal is greatly increased.
Proposal for geometric generation of a biexciton in a quantum dot using a chirped pulse  [PDF]
H. Y. Hui,R. -B. Liu
Physics , 2008, DOI: 10.1103/PhysRevB.78.155315
Abstract: We propose to create a biexciton by a coherent optical process using a frequency-sweeping (chirped) laser pulse. In contrast to the two-photon Rabi flop scheme, the present method uses the state transfer through avoided level crossing and is a geometric control. The proposed process is robust against pulse area uncertainty, detuning, and dephasing. The speed of the adiabatic operation is constrained by the biexciton binding energy.
Chirped-pulse oscillators: a unified standpoint  [PDF]
V. L. Kalashnikov,A. Apolonski
Physics , 2008, DOI: 10.1103/PhysRevA.79.043829
Abstract: A completely analytical and unified approach to the theory of chirped-pulse oscillators is presented. The approach developed is based on the approximate integration of the generalized nonlinear complex Ginzburg-Landau equation and demonstrates that a chirped-pulse oscillator is controlled by only two parameters. It makes it easy to trace spread of the real-world characteristics of both solid-state and fiber oscillators operating in the positive dispersion regime.
The unified theory of chirped-pulse oscillators  [PDF]
Vladimir L. Kalashnikov
Physics , 2009, DOI: 10.1117/12.820689
Abstract: A completely analytical theory of chirped-pulse oscillators is presented. The theory is based on an approximate integration of the generalized nonlinear complex Ginzburg-Landau equation. The obtained parametric space of a chirped-pulse oscillator allows easy tracing the characteristics of both solid-state and fiber oscillators operating in the positive dispersion regime.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.