Observation of the second harmonic in Thomson scattering from relativistic electrons
Observation of the second harmonic in Thomson scattering from relativistic electrons
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DOI：
10.1103/physrevlett.96.054802
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发表时间：
2006-02-10
影响因子：
8.6
通讯作者：
Yokoya, K
中科院分区：
文献类型：
--
作者：
Babzien, M;Ben-Zvi, I;Yokoya, K
电磁场中的自由相对论电子是光与物质相互作用的纯粹例子。在实验室环境中，这种相互作用可以通过将激光脉冲与粒子加速器产生的电子束碰撞来实现。电子的单光子吸收和再发射过程，即所谓的线性汤姆逊散射，导致辐射多普勒频移到x射线和伽马射线区域。当激光强度增加时，当激光束引起的电子横向运动是相对论性的时，非线性效应就会发挥作用。在本实验中，我们实现了这一条件，其特征在于使用60 MeV的电子束和亚太瓦CO2激光束的反向传播的汤姆逊X射线散射的二次谐波。
A free relativistic electron in an electromagnetic field is a pure case of a light-matter interaction. In the laboratory environment, this interaction can be realized by colliding laser pulses with electron beams produced from particle accelerators. The process of single photon absorption and reemission by the electron, so-called linear Thomson scattering, results in radiation that is Doppler shifted into the x-ray and gamma-ray regions. At elevated laser intensity, nonlinear effects should come into play when the transverse motion of the electrons induced by the laser beam is relativistic. In the present experiment, we achieved this condition and characterized the second harmonic of Thomson x-ray scattering using the counterpropagation of a 60 MeV electron beam and a subterawatt CO2 laser beam.