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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Nanosecond Time-Resolved Observations of Laser Ablation of Silver in Water
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Nanosecond Time-Resolved Observations of Laser Ablation of Silver in Water

机译：纳秒时间分辨的激光烧蚀水中银的观察结果

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摘要

Nanosecond-resolved shadowgraphs and optical emission spectra were observed for the laser ablation of a silver plate in water to investigate the formation process of nanoparticles. Optical emissions, a Shockwave, and a cavitation bubble were generated sequentially from the target surface after laser irradiation. In the optical emission spectra, continuous bands were observed, which were probably attributable to bremsstrahlung and/or electron-ion recombination. These findings suggest that materials emitted by laser ablation were confined by the surrounding water causing high pressure, which etches the target surface. Results show that nanoparticles are formed in the cavitation bubbles rather than in the bulk water from materials that were emitted via both direct laser ablation and secondary etching. In addition, a second Shockwave was observed upon the collapse of the cavitation bubble, indicating that another secondary etching process might accompany nanoparticle formation.
机译：观察纳秒分辨的阴影图和光发射光谱，以对水中的银板进行激光烧蚀，以研究纳米颗粒的形成过程。激光照射后，从目标表面依次产生光发射，冲击波和空化气泡。在光发射光谱中，观察到连续的带，这可能归因于致辐射和/或电子-离子重组。这些发现表明，激光烧蚀发射的材料被周围的水所限制，从而引起高压，从而腐蚀目标表面。结果表明，纳米粒子是在空化气泡中形成的，而不是在通过直接激光烧蚀和二次刻蚀同时发射的材料的大量水中形成的。另外，在空化气泡破裂时观察到第二次冲击波，表明另一次二次蚀刻过程可能伴随纳米颗粒的形成。

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