Comparative study of ablation processes using femtosecond and nanosecond lasers

IF 4.6 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics Pub Date : 2025-08-27 DOI:10.1016/j.rinp.2025.108415

J.Z. Wang , Y. Kanematsu , A. Muratsugu , F. Matsuda , W. Matsuda , Y. Kawai , M. Toyoda

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Abstract

This study investigated the dynamic characteristics of ions emitted from materials subjected to short-pulsed laser interactions. To investigate the difference in ablation dynamics due to laser pulse irradiation with the same energy but different time scales, we developed a time-of-flight (TOF) mass spectrometer and analyzed the TOF ion profiles obtained by irradiating 180 fs 800 nm Ti:sapphire femtosecond laser and 1 ns 355 nm Nd:YAG nanosecond laser. The effects of incident laser interaction with CsI deposits were examined for laser pulse energies ranging from 400 to 1000 nJ, corresponding to laser intensities of 7.1 × 10¹¹–1.8 × 10¹² W/cm² for femtosecond lasers and 1.3–3.2 × 10⁸ W/cm² for nanosecond lasers. With an ion trajectory simulation incorporating a shifted Maxwell–Boltzmann initial velocity distribution and continuous ion emission, we analyzed the ion emission dynamics from the TOF profiles. Compared with nanosecond lasers, femtosecond lasers generated ions with higher initial velocities but lower temperatures. Under nanosecond laser irradiation, ion emission continued for tens of nanoseconds after the end of the laser pulse, and its duration increased with increasing laser pulse energy. However, no continuous emission occurred under femtosecond laser irradiation.

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飞秒和纳秒激光烧蚀过程的比较研究

本文研究了受短脉冲激光相互作用的材料所发射离子的动力学特性。为了研究相同能量但不同时间尺度激光脉冲辐照对烧蚀动力学的影响，我们研制了飞行时间质谱仪，分析了180 fs 800 nm Ti：蓝宝石飞秒激光和1 ns 355 nm Nd:YAG纳秒激光辐照得到的TOF离子谱图。在400 ~ 1000 nJ的激光脉冲能量范围内，即飞秒激光器的激光强度为7.1 × 1011 ~ 1.8 × 1012 W/cm2，纳秒激光器的激光强度为1.3 ~ 3.2 × 108 W/cm2，研究了入射激光与CsI沉积物相互作用的影响。通过结合移动的麦克斯韦-玻尔兹曼初速度分布和连续离子发射的离子轨迹模拟，我们分析了来自TOF剖面的离子发射动力学。与纳秒激光器相比，飞秒激光器产生的离子具有更高的初始速度和更低的温度。在纳秒激光照射下，离子发射在激光脉冲结束后仍持续数十纳秒，且持续时间随激光脉冲能量的增加而增加。而在飞秒激光照射下，不发生连续发射。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY

CiteScore

8.70

自引率

9.40%

发文量

754

审稿时长

50 days

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