The interest in pulsation process of laser-induced cavitation bubble in infinite domain or near a solid boundary has increased greatly in recent years. However, studies on dynamics of laser-induced bubbles near a small hole are few. In this work, dynamics of laser-induced cavitation bubbles before and after going through a small hole was studied by high-speed imaging. Various dimensionless parameter, laser energies, hole diameters and hole lengths were selected to investigate the bubble pulsation. Furthermore, a novel surface treatment method of small hole assisted laser cavitation processing in SiO₂ particles suspension was proposed to improve surface quality. The surface morphology, residual stress, and roughness of 1060 aluminium alloy after laser cavitation processing were investigated. Results indicate that dimensionless parameter and hole’s size have a great impact on bubble pulsation. Maximum instantaneous velocity of the front and rear walls of the bubbles is about 47 m/s and 119 m/s respectively when the bubble pulsates behind the hole. The movements of the bubbles may cause the particles to impact the surface, producing small hollows and providing concentrated residual stress.

近年来，人们对在无限域或接近固体边界的激光空化气泡的脉动过程的兴趣大大增加。然而，很少有关于小孔附近的激光诱导气泡动力学的研究。在这项工作中，通过高速成像研究了通过小孔前后激光引起的空化气泡的动力学。选择各种无因次参数，激光能量，孔径和孔径来研究气泡脉动。此外，一种新的SiO ₂小孔辅助激光空化处理的表面处理方法提出了悬浮颗粒以改善表面质量。研究了激光空化处理后1060铝合金的表面形貌，残余应力和粗糙度。结果表明，无因次参数和孔的大小对气泡脉动有很大的影响。当气泡在孔后面跳动时，气泡的前壁和后壁的最大瞬时速度分别为约47 m / s和119 m / s。气泡的运动可能会导致颗粒撞击表面，产生小的凹陷并提供集中的残余应力。