Laser ablation of liquid surface in air induced by laser irradiation through liquid medium

被引：0
作者：
Yuji Utsunomiya
Takashi Kajiwara
Takashi Nishiyama
Kunihito Nagayama
Shiro Kubota
Motonao Nakahara
机构：
[1] Kyushu University,Faculty of Engineering
[2] National Institute of Advanced Industrial Science and Technology,Research Core for Explosion Safety
[3] Fukuoka Institute of Technology,Faculty of Engineering
来源：
Applied Physics A | 2010年 / 101卷
关键词：
Laser Ablation; Liquid Surface; Plasma Plume; Pulse Laser Ablation; Ablation Threshold;
D O I：
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学科分类号：
摘要：
The pulse laser ablation of a liquid surface in air when induced by laser irradiation through a liquid medium has been experimentally investigated. A supersonic liquid jet is observed at the liquid–air interface. The liquid surface layer is driven by a plasma plume that is produced by laser ablation at the layer, resulting in a liquid jet. This phenomenon occurs only when an Nd:YAG laser pulse (wavelength: 1064 nm) is focused from the liquid onto air at a low fluence of 20 J/cm2. In this case, as Fresnel’s law shows, the incident and reflected electric fields near the liquid surface layer are superposed constructively. In contrast, when the incident laser is focused from air onto the liquid, a liquid jet is produced only at an extremely high fluence, several times larger than that in the former case. The similarities and differences in the liquid jets and atomization processes are studied for several liquid samples, including water, ethanol, and vacuum oil. The laser ablation of the liquid surface is found to depend on the incident laser energy and laser fluence. A pulse laser light source and high-resolution film are required to observe the detailed structure of a liquid jet.
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页码：137 / 141
页数：4
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