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超强超短脉冲激光广泛应用于粒子加速以及新型X射线辐射源产生。较长的激光脉冲上升前沿直接影响激光应用效果。等离子体薄膜靶作为新型光学介质开关,可以有效降低超强激光脉冲前沿上升时间,优化激光等离子体相互作用参数。采用一维理论分析和粒子模拟方法研究了等离子体薄膜靶实现超强激光脉冲整形的机制。研究结果表明,薄膜靶通过对激光脉冲的非线性调制,可有效实现脉宽缩短和脉冲陡化;对比单层靶调制结果,选择参数优化的双层靶,可进一步优化脉冲整形效果,获得更短脉宽和更高振幅的激光脉冲;对于峰值振幅高于薄膜靶击穿阈值的超强激光,脉冲上升前沿可得到明显陡化,薄膜靶的击穿是产生这种脉冲整形效果的直接原因。
Super short pulse laser is widely used in particle acceleration and new generation of X-ray radiation. Longer laser pulse rise front directly affect the laser application effect. As a new type of optical medium switch, the plasma film target can effectively reduce the rise time of the superlattice laser pulse and optimize the laser plasma interaction parameters. One-dimensional theoretical analysis and particle simulation methods were used to study the mechanism of super-intense laser pulse shaping by plasma film targets. The results show that the film target can shorten the pulse width and pulse steep by nonlinear modulation of the laser pulse. By comparing the single-layer target modulation results with the optimized double-layer target, the pulse shaping effect can be further optimized to obtain more Short pulse width and higher amplitude laser pulse. For the super laser with the peak amplitude higher than the film target breakdown threshold, the rising edge of the pulse can be obviously steep. The breakdown of the film target is the direct cause of this pulse shaping effect .