title: Influence of pointing fluctuation on intense laser beams propagation in plasma channels.
abstract: An off-axis incident model is presented to analyze the influence of beam pointing fluctuation on the propagation properties of intense laser beams in plasma channels. The equations for the beam spot size and centroid are obtained by applying the variational method. The beam pointing fluctuation contributes additional focusing effect by amplifying relativistic self-focusing, leading to periodically modified oscillations of the spot size. The beam centroid oscillates along the channel axis with the amplitude close to its initial off-axis displacement, while the oscillation frequency is scaled as the square of the dimensionless channel strength parameter.
authors.affiliation: State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, ChineseAcademy of Sciences, Shanghai 201800, China.
authors.forename: Mingwei
authors.initials: M
authors.lastname: Liu
authors.forename: Aihua
authors.initials: A
authors.lastname: Deng
authors.forename: Changquan
authors.initials: C
authors.lastname: Xia
authors.forename: Jiansheng
authors.initials: J
authors.lastname: Liu
authors.forename: Cheng
authors.initials: C
authors.lastname: Wang
authors.forename: Ruxin
authors.initials: R
authors.lastname: Li
authors.forename: Zhizhan
authors.initials: Z
authors.lastname: Xu