大动力学蓝移与谐波产生的空间分离
Spatial separation of large dynamical blue shift and harmonic generation
摘要：
我们研究的时间和空间动力学的大幅度和频率调制，可以诱导在一个强烈的，几个周期的激光脉冲，因为它通过快速电离气体传播。我们的计算包括单原子和宏观之间的非线性介质和激光场的相互作用。我们分析了这种脉冲的谐波产生，并表明它是空间分离的电离动力学产生一个大的动态蓝移的激光脉冲。这意味着即使产生的谐波光谱基本保持不变，初始激光聚焦条件的微小变化也会导致激光频率调制的巨大差异。
英文摘要：
We study the temporal and spatial dynamics of the large amplitude and frequency modulation that can be induced in an intense, few cycle laser pulse as it propagates through a rapidly ionizing gas. Our calculations include both single atom and macroscopic interactions between the non-linear medium and the laser field. We analyze the harmonic generation by such pulses and show that it is spatially separated from the ionization dynamics which produce a large dynamical blue shift of the laser pulse. This means that small changes in the initial laser focusing conditions can lead to large differences in the laser frequency modulation, even though the generated harmonic spectrum remains essentially unchanged.
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