摘要
利用经典电磁辐射理论研究周期量级线偏振激光脉冲的90°Thomson线性散射。结果表明,脉冲所包含的光周期数越少,散射能谱越宽,谱中心处强度越小;谱宽度与电子相对论因子的平方及入射光脉冲频率成正比;谱强度与归一化光场强度和相对论因子乘积的平方均成正比,载波包络函数使光场中电子运动的时间和空间周期减小;进一步展宽散射能谱,使谱对称性变好,消除散射谱振荡;低于某一频率时,谱强度随载波包络初相的增大而减小,高于此频率时,谱强度随载波包络初相的增大而增大;电子进入光场初相的增大削弱了散射谱的强度。
Based on the classical electromagnetic radiation theory, the spectral characteristics of 90° linear Thomson scattering with linearly polarized few-cycle laser pulses were obtained. The research results showed that the fewer the cycle number of the few-cycle pulse was, the wider the scattering spectrum and the weaker the center intensity of the spectrum were, and the spectral width was proportional to the square of the electronic relativity factor, as well as the incidence pulse frequency. The spectral intensity was proportional to the square of the product of normalized light field intensity and electronic relativity factor. The carrier-envelope function could widen radiation spectrum further and make the spectrum symmetry better and eliminate the oscillation of spectrum. The spectral intensity decreased with the increase of the carrier-envelope offset phase first, and then increased and it decreased with the electron initial phase being enhanced.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2006年第9期1499-1503,共5页
High Power Laser and Particle Beams
