For a neodymium glass laser, which is used to pump the parametric amplifier of the PEARL facility, we investigate the problem of filling the pinholes of vacuum spatial filters with plasma resulting from the ablation of the pinhole surface by laser radiation. The time of plasma expansion is measured and the causes of its appearance are determined, among which the main ones are the spherical aberrations of the lenses of spatial filters, which increase the intensity at the pinhole edges. With the total spherical aberration of the spatial filters, which lowers the Strehl number to 0.15, two nanosecond pulses with energies of 130 – 140 J, delayed relative to each other by 1.8 ns and freely passing through the final spatial filter, are generated on the PEARL facility.

对于用于泵浦 PEARL 设施的参量放大器的钕玻璃激光器，我们研究了用激光辐射烧蚀针孔表面产生的等离子体填充真空空间过滤器的针孔的问题。测量等离子体膨胀的时间并确定其出现的原因，其中主要是空间滤光片透镜的球面像差，这增加了针孔边缘的强度。由于空间滤波器的总球面像差将斯特列尔数降低到 0.15，两个纳秒脉冲的能量为 130 – 140 J，相对于彼此延迟 1.8 ns 并自由通过最终的空间滤波器，在珍珠设施。