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Experimental study of filamentation of high-power ultrashort laser pulses with initial angular divergence in air

机译：空气中初始角发散的高功率超短激光脉冲细丝化的实验研究

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Experimental study of the nonlinear propagation of near-IR gigawatt femtosecond laser pulses in air in the self-focusing and filamentation regimes have been performed in open air and in laboratory. The influence of the initial geometric divergence (both positive and negative) of the laser beam with an irregular intensity profile on the transverse light energy distribution at the end of the path is studied. It is shown experimentally that the displacement of the filamentation region due to geometric focusing or defocusing, makes it possible to control the number and spatial location of light energy density peaks in the receiving plane. The conditions under which a light filament can be reconstructed after the beam transmission through a linear focal waist are determined. A semi-empirical threshold relation is obtained for the beam focusing force and the beam power, when light beam undergoes filamentation behind the geometric focus of the optical system.
机译：在露天和实验室中，已经进行了在自聚焦和长丝状态下近红外吉瓦飞秒激光脉冲在空气中非线性传播的实验研究。研究了具有不规则强度分布的激光束的初始几何发散度（正向和负向）对路径末端横向光能分布的影响。实验表明，由于几何聚焦或散焦，丝状区域的位移使得可以控制光能密度峰值在接收平面中的数量和空间位置。确定在光束通过线性焦腰传输之后可以重建灯丝的条件。当光束在光学系统的几何焦点后面经历细丝化时，获得光束聚焦力和光束功率的半经验阈值关系。

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