State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, Peking University, Beijing 100871, China.
CICEO, Shanxi University, Taiyuan, Shanxi 030006, China.
Phys Rev E. 2019 Dec;100(6-1):063203. doi: 10.1103/PhysRevE.100.063203.
A deflection effect of an intense laser beam with spin angular momentum is revealed theoretically by an analytical modeling using radiation pressure and momentum balance of laser plasma interaction in the relativistic regime as a deviation from the law of reflection. The reflected beam deflects out of the plane of incidence with a deflection angle up to several milliradians, when a nonlinear polarized laser, with the intensity I_{0}∼10^{19}W/cm^{2} and duration around tens of femtoseconds, is obliquely incident and reflected by an overdense plasma target. This effect originates from the asymmetric radiation pressure caused by spin angular momentum of the laser photons. The dependence of the deflection angle of a Gaussian-type laser on the parameters of laser pulse and plasma foil is theoretically derived, which is also confirmed by three-dimensional particle-in-cell simulations of circularly polarized laser beams with the different intensity and pulse duration.
一种具有角动量的强激光束的偏转效应，通过辐射压力的分析模型和相对论激光等离子体相互作用的动量平衡来揭示，这是对反射定律的偏离。当强度为 I_{0}∼10^{19}W/cm^{2}、持续时间约为数十飞秒的非线性偏振激光斜入射并被超密度等离子体靶反射时，反射光束会偏离入射平面，偏转角可达数毫弧度。这种效应源于激光光子角动量引起的不对称辐射压力。理论上推导出了高斯型激光的偏转角与激光脉冲和等离子体箔参数的关系，这也通过不同强度和脉冲持续时间的圆形偏振激光束的三维粒子模拟得到了证实。
