Femtosecond pulse compression in pressure-gas cells filled with argon.
Femtosecond pulse compression in pressure-gas cells filled with argon.
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DOI：
10.1103/physreve.68.066603
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发表时间：
2003-12
期刊：
影响因子：
--
通讯作者：
S. Champeaux;L. Bergé
中科院分区：
文献类型：
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作者：
S. Champeaux;L. Bergé
研究了飞秒脉冲在充氩压力气体池中的非线性传输。通过增加压力达到峰值功率水平接近阈值的自聚焦，它表明，无论是群速度色散或多光子电离（MPI）源可以成为关键球员逮捕的光束崩溃。对于明显高于临界的输入功率，MPI迅速占主导地位，并形成自引导灯丝的光发生。我们讨论了MPI的动力学作用，在缩短脉冲持续时间的光周期限制。两个不同的波长域进行了评论。进一步讨论了时空聚焦效应和自陡效应的影响。它们各自的作用，促进冲击结构的研究，并示出仍然促进脉冲缩短在合适的功率制度。最后分析了光谱展宽对大波长激光的影响。传播方程的数值积分的解释，在光的分析参数。
The nonlinear propagation of femtosecond pulses in pressure-gas cells filled with argon is investigated. By increasing the pressure for reaching peak power levels close to the threshold for self-focusing, it is shown that either group-velocity dispersion or multiphoton ionizing (MPI) sources can become key players for arresting the beam collapse. For input powers noticeably above critical, MPI rapidly dominates and the formation of self-guided filaments of light occurs. We discuss the dynamical role of MPI in shortening the pulse duration up to the optical cycle limit. Two different wavelength domains are commented. The influence of space-time focusing and self-steepening effects is furthermore discussed. Their respective roles in promoting shock structures are studied and shown to still promote pulse shortening in suitable power regimes. Finally, spectral broadening is analyzed and proven to be more important for large laser wavelengths. Numerical integration of the propagation equations is explained in the light of analytical arguments.