Dynamic features of bubble induced by a nanosecond pulse laser in still and flowing water

Journal article

Authors/Editors

VIBOON SAETANG

Strategic Research Themes

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Publication Details

Author list: Charee W., Tangwarodomnukun V.

Publisher: Elsevier

Publication year: 2018

Journal: Optics & Laser Technology (0030-3992)

Volume number: 100

Start page: 230

End page: 243

Number of pages: 14

ISSN: 0030-3992

eISSN: 1879-2545

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85032293966&doi=10.1016%2fj.optlastec.2017.10.019&partnerID=40&md5=708b095385d0c713d5e28ff5300f0f0e

Languages: English-Great Britain (EN-GB)

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Abstract

Underwater laser ablation techniques have been developed and employed to synthesis nanoparticles, to texture workpiece surface and to assist the material removal in laser machining process. However, the understanding of laser-material-water interactions, bubble formation and effects of water flow on ablation performance has still been very limited. This paper thus aims at exploring the formation and collapse of bubbles during the laser ablation of silicon in water. The effects of water flow rate on bubble formation and its consequences to the laser disturbance and cut features obtained in silicon were observed by using a high speed camera. A nanosecond pulse laser emitting the laser pulse energy of 0.2–0.5 mJ was employed in the experiment. The results showed that the bubble size was found to increase with the laser pulse energy. The use of high water flow rate can importantly facilitate the ejection of ablated particles from the workpiece surface, hence resulting in less deposition to the work surface and minimizing any disturbance to the laser beam during the ablation in water. Furthermore, a clean micro-groove in silicon wafer can successfully be produced when the process was performed in the high water flow rate condition. The findings of this study could provide an essential guideline for process selection, control and improvement in the laser micro-/submicro-fabrication using the underwater technique. © 2017 Elsevier Ltd

Keywords

bubble