飞秒双脉冲实验中烧蚀的抑制
Suppression of ablation in femtosecond double pulse experiments
摘要：
我们报告的物理原因的一个奇怪的减少在长时间延迟的实验中观察到的陨石坑深度飞秒双脉冲。详细的流体动力学模型表明，当脉冲之间的延迟超过电子-离子弛豫时间时，烧蚀机制被转储。在这种情况下，第二激光脉冲与膨胀的目标材料的相互作用导致第二冲击波的形成，该第二冲击波抑制由第一脉冲产生的稀疏波。这种效应的证据如下的压力和密度分布在不同的延迟后，第一个激光脉冲。
英文摘要：
We report the physical reasons of a curious decrease in the crater depth observed for long delays in experiments with femtosecond double pulses. Detailed hydrodynamic modeling demonstrates that the ablation mechanism is dumped when the delay between the pulses exceeds the electron-ion relaxation time. In this case, the interaction of the second laser pulse with the expanding target material leads to the formation of the second shock wave suppressing the rarefaction wave created by the first pulse. The evidence of this effect follows from the pressure and density profiles obtained at different delays after the first laser pulse.
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