论文标题
用中红外飞秒脉冲照射的透明材料的电离动力学和损伤条件
Ionization dynamics and damage conditions for transparent materials irradiated with Mid-Infrared femtosecond pulses
论文作者
论文摘要
透明材料的使用超时激光源用于透明材料，旨在为激光构图开放新路线，并在光学和光子学方面开设了大量令人兴奋的应用。为了阐明用中IR激光源对辐射的材料响应，提出了对长波长飞秒脉冲与介电材料的相互作用的一致分析。尤其是在指定光电离电离和影响电离很重要的激光参数方面，脉冲持续时间的影响是指向激光参数。使用2.2 MUM处的脉冲，3.2 MUM和5 MUM进行模拟结果，以说明与光学崩溃发生有关的固体损伤发作的最佳条件。结果预测，在所有激光波长下，损坏阈值量表为〜$τ_p^α$（0.31 <$α$ <0.37）。鉴于诱导的激发水平对表面等离子体的激发（SP）的显着影响，该表面等离子体（SP）解释了激光诱导的周期性结构（LIPS）垂直于激光极化的定向，而产生的电子密度与SP的相关性，SP的阈值以及SP激发的阈值（〜$τ_p^$，0.33 $，0.33 $，0.33 <$ <0. 33 <0.333 <$ <。未开发的光谱区域。预计结果将允许具有强大的MID-IR脉冲的新型表面图案方法用于高级应用。
The employment of ultrashort laser sources at the mid-IR spectral region for transparent materials is designed to open new routes for laser patterning and a wealth of exciting applications in optics and photonics. To elucidate the material response to irradiation with mid-IR laser sources, a consistent analysis of the interaction of long wavelength femtosecond pulses with dielectric materials is presented. The influence of the pulse duration is, in particularly, emphasized towards specifying the laser parameters for which photoionization and impact ionization are important. Simulations results using pulses at 2.2 mum, 3.2 mum and 5 mum are conducted to illustrate the optimum conditions for the onset of damage on the solid that is related to the occurrence of the optical breakdown. Results predict that the damage threshold scales as ~$τ_p^α$ (0.31<$α$<0.37) at all laser wavelengths. Given the significant effect of the induced excitation level on the excitation of Surface Plasmons (SP) which account for the formation of laser induced periodic structures (LIPSS) oriented perpendicular to the laser polarization, a correlation of the produced electron densities with SP and the threshold of SP excitation (~$τ_p^β$, 0.33<$β$<0.39) are also discussed in this yet unexplored spectral region. Results are expected to allow a novel surface patterning approach with strong mid-IR pulses for advanced applications.
