Microexplosions in Bulk Sapphire Driven by Simultaneously Spatially and Temporally Focused Femtosecond Laser Beams
Microexplosions in Bulk Sapphire Driven by Simultaneously Spatially and Temporally Focused Femtosecond Laser Beams
复制标题
同时空间和时间聚焦飞秒激光束驱动块状蓝宝石中的微爆炸
DOI：
10.1109/cleo/europe-eqec57999.2023.10231958
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
P. Polynkin
中科院分区：
文献类型：
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作者：
W. Cheng;Zhaohui Wang;Xiaolong Liu;Anton Rudenko;Ya Cheng;P. Polynkin
有人认为，在透明电介质[1]内部，由紧密聚焦的飞秒激光脉冲驱动的密闭微爆炸会在桌面产生极端的压力和温度条件。早期估计表明，可以实现超过10tpa的瞬态压力。我们基于光场的非旁轴麦克斯韦传播子的数值分析[3]，由非旁轴边界条件启动，并结合材料响应的速率方程，显示了相互作用体积中自由电子密度和温度的刚性夹紧（图1）。固定值对应于可达到的峰值压力~ 250 GPa，比之前的估计低两个数量级。我们的数值结果对于电离和电子加热参数的非常大的变化是稳健的，从它们的标称接受值上升或下降一个数量级。
Confined microexplosions driven by tightly focused femtosecond laser pulses inside the bulk of transparent dielectrics [1] had been argued to produce extreme pressure and temperature conditions on the tabletop. Early estimates suggested that transient pressures exceeding 10 TPa can be attainable [2]. Our numerical analysis [3] based on the non-paraxial Maxwell propagator for the optical field, initiated by the non-paraxial boundary conditions and coupled with the rate equations for the material response, shows rigid clamping of both the free-electron density and temperature in the interaction volume (Figure 1). The clamped values correspond [4] to the peak attainable pressures of ~ 250 GPa, which is about two orders of magnitude lower than the earlier estimates [2]. Our numerical results are robust against very large variations of the ionization and electron-heating parameters of up to one order of magnitude up or down from their nominal accepted values.