In this paper, we compare the properties of filaments generated in a Ne–N₂ mixture, pure N₂, a Kr–N₂ mixture, and a Xe–N₂ mixture pumped by femtosecond laser pulses systematically. Due to different nonlinear refractive indices and ionization potentials of these noble gases, the clamped intensity and plasma density can be tuned in a certain range when small amounts of different noble gases are injected into pure N₂. In addition, we also demonstrate that a higher proportion of noble gas and shorter incident pulse duration can have the benefit of manipulating the plasma density on a relatively larger scale.

中文翻译：

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飞秒激光脉冲泵浦的气体混合物中产生的细丝特性的研究

在本文中，我们系统地比较了由飞秒激光脉冲泵浦的 Ne-N ₂混合物、纯 N ₂、Kr-N ₂混合物和 Xe-N ₂混合物中生成的灯丝的特性。由于这些惰性气体具有不同的非线性折射率和电离电位，因此当将少量不同的惰性气体注入纯N _{2 中}时，可以在一定范围内调节钳位强度和等离子体密度。此外，我们还证明更高比例的惰性气体和更短的入射脉冲持续时间可以在相对更大的范围内操纵等离子体密度。