Evolution of Electron Phase Orbits Based on Multi-photon Nonlinear Compton Scattering

The electron movement based on the multi-photon nonlinear Compton scattering with the extra-intense stationary laser field is discussed by using KMR (Kroll-Morton-Rosenbluth) theory.We find that there exists only an evolution from periodicity to non-periodicity of the un-captured electron phase orbits after the energy exchange between the electron beam and laser fields.With the increase of the absorbed photon number n by an electron, this evolution will be more and more faster, while it is rapidly decreased with the enhancement of the collision non-flexibility ξ of the electrons and photons; When the electrons are captured by the laser fields, the evolution is finished, the electrons will stably transport,and the photons dont give up the energy to these electrons.

Evolution of Electron Phase Orbits of Multi-photon Nonlinear Compton Scattering in High Power Laser-plasma

The evolution of the electron phase orbits based on the multi-photon nonlinear Compton scattering with the high power laser-plasma is discussed by using Kroll-Morton-Rosenbluth theory. The random evolution of the un-captured electron phase orbits from periodicity to non-periodicity is found after the energy has been exchanged between the electron and photons. With the increase of the absorbed photon number n by an electron,this evolution will be more and more intense, while which is rapidly decreased with the enhancement of the collision non-flexibility ξ and their initial speeds of the electrons and photons,but this evolution is lower than that in the high power laser field. When the electrons are captured by the laser field,the evolution is finished,and the electrons will stably transport,and the photons don’t provide the energy for these electrons any more.

Properties of Differential Scattering Section Based on Multi-photon Nonlinear Compton Effect

Properties of damping electrons in collision with photons based on multi-photon nonlinear Compton effect are investigated. The expressions of the differential scattering section are derived. Several useful conclusions are drawn.

Dispersion Properties of TIRPCF under Compton Scattering

The dispersion properties in the short wavelength region of total internal reflective photonic crystal fiber(TIRPCF) in Compton scattering have been studied by using the model of the equivalent twin waveguide soliton coupling, dispersion management solitons and effective refractive index. It is shown that the positive dispersion of the cladding waveguide of TIRPCF and the negative dispersion of its core waveguide are quickly increased by the square of the collision non-elastic composition between the electron and photons, and they are lessened by the increase of the electron absorption photon number. Under the one-photon nonlinear Compton scattering, the method of the compensated probing laser diffraction by the phase hole induced by the stationary pumping laser in the cladding waveguide enables the average dispersion value of TIRPCF to be close to zero, and the zero dispersion point quickly shifts to the short wavelength region.

Influence on Atomic Inversion Evolution in Medium System from Compton Scattering

In Jaynes-Cummings model,by using the modulation of the coupling coefficient formed by the atom,medium and scattering optical,atomic inversion evolution of arbitrary forms has been worked out.Its feasibility has been proved,and the curvature of the atomic inversion evolution of the arbitrary forms is obtained.It announces that the atom and coupling medium system are to express the operators of the atom and optical field quantum in Jaynes-Cummings model.These operators can express arbitrary medium system.In these systems,the coupling coefficient can be changed and exactly controlled in the longer coherent times.

Photon Polarizationin Photonic Crystal Fibers under Compton Scattering

Using the quantum invariant theory and unitary transformation means, we study the influences of multi-photon nonlinear Compton scattering on the photon polarization in photonic crystal fibers(PCF). The results show that the photon polarization of the incident photon changes a lot due to scattered optical, and its general geometric phase factor, Hamiton number and evolution operator are definited both by the incident and scattered optical.

多光子非线性Compton散射下的调制不稳定性对波分复用系统的影响

运用小信号分析法,研究了多光子非线性Compton散射下的调制不稳定性(MI)对波分复用系统的影响,结果表明:计及散射光的调制不稳定性,不仅会使波分复用系统的信噪比(SNR)更快地下降,从而导致信号强度更快地减弱,而且还会对噪声有更大的放大作用;这种调制不稳定性对波分复用系统中各信道的影响是不同的,它对短波段的作用强于长波段,也会使各信道的信噪比产生更大的偏差,将使长波段较短波段有更大的信噪比,信噪比的降低将随着长度的增加有较快的积累。

Compton散射下激光等离子体界面附近电子的运动

研究了多光子非线性Compton散射下等离子体中两个不同密度区的界面附近耦合激光场中电子的运动,导出了电子的横向动量与纵向动量相互关系的一般方程.研究发现:介质的非均匀性导致电子运动特性的重要变化,在一定的条件下,这种非均匀性有利于注入电子获得加速;散射可有效地降低弹推阈值.当耦合脉冲强度低于弹推阈值时,电子最终被脉冲超过,但无论对初始时刻静止的电子还是运动的电子,能量增益均不为0,且随注入能量的提高而迅速地增加.当耦合脉冲强度高于弹推阈值时,电子最终超过脉冲而获得很高的能量增益,其值远远高于均匀等离子体的情况.在入射相同能量的情况下,耦合光会使电子获得更高的能量增益.

锥形激光等离子体中Compton散射对电子的加速

应用相对论性电子与光子非弹性碰撞模型和经典相对论电动力学理论,结合锥形飞秒强激光等离子体中的光场特性和静电场能,分析、计算了入射的高能电子束与等离子体中的光子发生多光子非线性Compton散射时对电子的加速效应,发现等离子体中的光场会引起电子加速能量的振荡;等离子体中的静电场降低电子的加速效应。用高能电子束与锥形飞秒强激光等离子体中的光子发生双光子非线性Compton散射,是加速电子最为理想的情况。

Compton散射下强激光等离子体空气冲击波波前的传输特性

根据球对称激光等离子体空气冲击波在自由空间中传输的约束条件,对多光子非线性Compton散射的强激光等离子体空气冲击波波前的传输特性进行了研究,给出了散射下空气冲击波波前的运动方程,并进行了数值模拟。结果表明:该冲击波的衰减过程不仅与爆炸源和爆炸过程的特性、释放总能量、空气的弹性有关,而且还与散射有关,散射效应使冲击波的初始半径增大,衰减过程加快,能量转移率提高;数值模拟与实验结果符合得很好。

Compton散射下等离子体中的离子加速

应用电子与多光子集团非线性Compton散射模型,将入射和散射光作为离子的传输机制,研究了Compton散射下多束相干强耦合激光等离子体中离子的运动,给出了相对论离子动力学方程,并进行了数值模拟。研究发现,散射使光的传播速度减小,系统的矢势和标势增大,由入射和散射光形成的多束相干强耦合激光能使质子加速到5.40GeV的能量,而耦合轴向电场在其中起着关键作用。

增益介质中Compton散射对小尺度自聚焦的影响

通过对激光放大介质中多光子非线性Compton散射光小尺度自聚焦特性的研究,提出了小尺度自聚焦的非线性理论,并对小尺度调制方程、增益谱和成丝距离进行了修正．研究发现:散射光的临界频率和最快增长频率近乎是相同的,在介质增益下,散射光引起的非线性扰动最快增长频率和最大增长率与背景光强度和传输距离几乎无关．在一定输入和输出功率下,在散射光出现的初始阶段,它使背景光的能量、小尺度扰动最快增长频率、最大增益和相应的B积分迅速增大,调制谱的范围迅速加宽,成丝距离延长;之后,它们的变化几乎与散射光无关．

Compton散射下激光等离子体纵波色散特性

应用电子与多光子集团非线性Compton散射模型,研究了Compton散射下激光等离子体纵波色散特性.结果表明:长波支纵色散曲线由解析上的长波、数值计算结果和短波组成,长波支和短波支纵色散均随相对论正负电子对特征温度的增大而增大,随Compton散射引起的频率的增量的增大而降低,且单温激光等离子体的色散曲线与散射前的双温等离子体的色散曲线相似.

Compton散射强光子流在等离子体通道中的传输特性

给出了冷等离子体中高阶相对论下多光子非线性Compton散射的光子流在等离子体通道中的传输方程,研究了高阶相对论效应对散射光子流传输的影响。在近轴近似下,散射强光子流依然有较浅的“势阱”方程。当散射强光子流强度较大时,高阶相对论效应变得更加重要:它减小了散射光束宽的振荡幅度,同时加快了散射光束宽的振荡速度。当散射强光子流功率大于或等于相对论临界功率时,高阶相对论效应避免了散射强光子流强度随传输距离出现无限大的奇异性。给出了散射强光子流的平衡解存在的条件。

Compton散射下等离子体中电子相轨道的演化

用KMR模型研究了等离子体中多光子非线性Compton散射下电子相轨道的演化,发现电子与光子进行能量交换后,只有未被俘获电子的相轨道才能从周期性向非周期性、随机型演化,其演化剧烈程度随电子吸收光子数的增大而加剧,随电子与光子碰撞非弹性成分和碰撞前初始速度的增大而迅速减弱,但低于强激光场中的剧烈程度。当电子被光场俘获时,这种演化过程结束并做稳定的运动,光子不再为电子提供能量。

强激光等离子体中多光子非线性Compton微分散射截面特性

研究了强激光等离子体中多光子非线性Compton效应下阻尼电子与光子的散射特性,推出了其微分散射截面表达式。研究表明,尾波场的涨落和随机误差是电子发生纵向群聚的根本原因,且能引起电子更剧烈的群聚。电子横向动量的变化是引起电子和光子散射的根本原因,其微分散射截面随与一个电子同时作用的光子数的增大而减小,随散射非弹性成分的增大而迅速减小,但比激光场中的情况来得慢一些。只有当与电子同时作用的光子数与散射非弹性成分相等时电子才能被光场俘获。

Compton散射下磁化等离子体光子晶体光子带隙特性

为了研究多光子非线性Compton散射对横向磁光效应磁化等离子体光子晶体光子带隙特性的影响,采用多光子非线性Compton散射模型和时域有限差分法进行了理论分析和实验验证,取得了关于晶体色散和调制不稳定性、光子带宽变化的重要数据,并提出了将入射光和Compton散射光作为磁化等离子体光子晶体色散的新机制。结果表明,Compton散射使等离子体色散增强,耦合电磁波通带变窄、阻带变宽,有效地降低了电磁波传输中的交叉相位调制的不稳定性,频率低于等离子体频率的电磁波在等离子体中的传播几率减小。

Compton散射对光纤中孤子压缩态传输的影响

应用非线性量子理论和修正非线性Schr(?)dinger方程,研究了多光子非线性Compton散射对孤子压缩态传输的影响,给出了孤子传输的压缩比。研究发现,在理想一阶孤子附近,随振幅的增大,散射能使孤子的最小压缩比更小,即能得到更大的孤子压缩态。随损耗的增大,压缩态呈较缓慢的减小。在相同损耗情况下,随振幅的增大,得到的最小压缩比所需传输距离较散射前短一些。

Compton散射对未磁化等离子体调制不稳定性的影响

为了研究Compton散射对未磁化等离子体调制不稳定性的影响,采用多光子非线性Compton散射模型,对Compton散射下的未磁化等离子体调制不稳定性进行了理论分析和实验验证,取得了散射对调制不稳定性的时间增长率、非线性色散和控制影响的重要数据,提出了将入射光和Compton散射光作为形成调制不稳定性的新机制。结果表明,Compton散射使未磁化等离子体的自调制不稳定性的最大时间增长率和激光自聚焦较散射前减小,等离子体截面附近处调制不稳定性的时间增长率较散射前增大。

Compton散射对等离子体MI基态增益谱的影响

应用多光子非线性Compton散射模型和非线性薛定谔方程,研究了多光子非线性Compton散射对等离子体中调制不稳定性基态增益谱的影响,提出了将入射光和Compton散射光作为产生调制不稳定性的新机制,给出了微扰的功率增益表达式,并进行了数值模拟。结果表明,入射光和Compton散射光共同决定了调制不稳定性的基态增益,Compton散射使扰动信号的功率和频率增大,从而使增益谱对应的频率范围和增益峰值增大。