研究目的
Investigating the influence of spatial confinement on the evolution of laser bubbles and shock waves produced by laser ablation in liquids.
研究成果
The study reveals that spatial confinement significantly affects the evolution of laser bubbles, with the bubble center collapsing before the edges due to the Bjerknes force. The Rayleigh-Plesset equation effectively describes bubble dynamics in the expansion stage. The findings provide insights into bubble behavior near walls, useful for applications in various engineering fields.
研究不足
The study is limited to the first bubble oscillation and does not extensively explore the effects of multiple bubble interactions or different liquid properties.
1：Experimental Design and Method Selection:
The study uses shadowgraphy technique to observe the evolution of laser bubbles and shock waves under spatial confinement. The Rayleigh-Plesset equation is employed to describe bubble dynamics.
2：Sample Selection and Data Sources:
Pure de-ionized water and aluminum targets are used. Data is collected through time-resolved shadowgraphy images.
3：List of Experimental Equipment and Materials:
Q-switched Nd:YAG pulse laser source, plano-convex lens, glass container, aluminum target, aluminum plate walls, CCD camera, picosecond Nd:YAG laser, digital delay pulse generator, high-speed visible photon detector.
4：Experimental Procedures and Operational Workflow:
Laser ablation is performed on an aluminum target under water with varying intervals of aluminum plate walls. The evolution of bubbles and shock waves is captured using shadowgraphy.
5：Data Analysis Methods:
The bubble radius is extracted numerically, and pressure and temperature inside the bubble are calculated using the Rayleigh-Plesset equation.
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Q-switched Nd:YAG pulse laser source
SGR-60
Beamtech Optronics Co., Ltd.
Used for laser ablation in liquids.
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CCD camera
700D
Canon
Used for capturing shadowgraphy images.
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Picosecond Nd:YAG laser
PL2251C-10-SH-FH-PreT
EKSPLA
Used as a probe laser beam for shadowgraphy.
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Digital delay pulse generator
DG535
Stanford Research Systems
Controls the timing of the Nd:YAG laser and probe laser.
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High-speed visible photon detector
DET10A
Thorlabs
Monitors the action of laser and records the time stamp.
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