研究目的
To study the thermal e?ect involved in the interaction of a capillary discharge 46.9 nm laser with copper, both theoretically and experimentally.
研究成果
The interaction of a 46.9 nm laser with copper involves significant thermal effects, leading to melting, evaporation, and resolidification of the copper surface. The fluence required for evaporation is much lower than that of optical lasers, indicating the promotion of thermal effects by high photon energy. This phenomenon warrants further study to understand the interaction of high energy photons with solid targets.
研究不足
The study focuses on the thermal effects of a 46.9 nm laser on copper, with potential areas for optimization including the understanding of the relationship between high photon energy and thermal effect, and the size distribution of ejected nanoparticles.
1：Experimental Design and Method Selection:
The study involved theoretical calculations and experimental observations of the interaction between a 46.9 nm laser and copper. The temperature variation of the laser-irradiated region was calculated using COMSOL Multiphysics based on the finite element algorithm (FEM).
2：9 nm laser and copper. The temperature variation of the laser-irradiated region was calculated using COMSOL Multiphysics based on the finite element algorithm (FEM).
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The target used was copper with a polished surface, preserved carefully to avoid oxide layer formation.
3：List of Experimental Equipment and Materials:
A nanosecond capillary discharge EUV laser operating at 46.9 nm, a toroidal mirror for focusing, an X-ray diode (XRD) for measuring laser energy, and a Scanning Electron Microscope (SEM) for detecting the damaged surface.
4：9 nm, a toroidal mirror for focusing, an X-ray diode (XRD) for measuring laser energy, and a Scanning Electron Microscope (SEM) for detecting the damaged surface.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser was focused onto the copper target at different positions. The surface was irradiated by multiple pulses, and the damaged area was analyzed using SEM.
5：Data Analysis Methods:
The temperature variation was simulated using COMSOL Multiphysics, and the ablation patterns were analyzed to study the thermal effects.
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