Pulse duration dependent nonlinear propagation of a focused femtosecond laser pulse in fused silica
Pulse duration dependent nonlinear propagation of a focused femtosecond laser pulse in fused silica
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DOI：
10.1364/oe.18.024495
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发表时间：
2010-11-22
期刊：
影响因子：
3.8
通讯作者：
Misawa, Hiroaki
中科院分区：
文献类型：
--
作者：
Sun, Quan;Asahi, Hidenori;Misawa, Hiroaki
通过实验和数值模拟研究了单脉冲聚焦飞秒激光在石英玻璃中的非线性传输。特别地，通过改变脉冲持续时间系统地研究了双折射行为。在低脉冲能量下，灯丝内的峰值等离子体密度首先随着脉冲持续时间的增加而增加到最大值，然后开始减小。在相对高的脉冲能量下，可以在具有一定较长脉冲持续时间的几何焦点周围诱导更密集的等离子体，其中峰值功率已经低于自聚焦临界功率并且没有形成细丝。这种依赖于脉冲持续时间的行为可以通过不同的电离机制来解释。(c)2010年美国光学学会
The nonlinear propagation of a single focused femtosecond laser pulse in fused silica has been investigated both experimentally and by numerical simulations. In particular, the filamentation behavior was systematically studied by varying pulse duration. At low pulse energy, the peak plasma density inside the filament first increases to a maximum value with increasing pulse duration and then begins to decrease. At relatively high pulse energy, denser plasma can be induced around the geometrical focus with a certain longer pulse duration, where the peak power is already below the self-focusing critical power and no filament is formed. This pulse duration dependent behavior can be explained by different ionization mechanisms. (c) 2010 Optical Society of America