研究目的
Investigating the ablation of thin metal films using ultrafast laser radiation, focusing on the formation of flat topologies and the underlying mechanisms involving rarefaction waves and hydrodynamic modeling.
研究成果
The study provides an improved understanding of the ablation of thin gold films using ultrafast laser radiation, explaining the formation of flat ablation structures through the interplay of rarefaction waves. The simulations show excellent agreement with experimental observations, validating the applied model. Future work could extend the model to include radial forces and stresses for a more comprehensive understanding.
研究不足
The study is limited by the one-dimensional nature of the hydrodynamic model, which neglects radial forces and stresses, and the simplification of neglecting the chromium layer in simulations. Additionally, the model cannot fully reproduce complex dynamics like the formation of foam-like structures or the correct dynamics of the tear-off of the cupola.
1：Experimental Design and Method Selection:
The study combines space and time-resolved reflectometry with expanded two-temperature hydrodynamic modeling to investigate the ablation of thin gold films.
2：Sample Selection and Data Sources:
A thin film of gold (150 nm thick) deposited on a fused silica substrate with an adhesion layer of chromium was irradiated by single-pulsed ultrafast laser radiation.
3：List of Experimental Equipment and Materials:
TiSa-Laser (Astrella, Coherent Inc.) for pump radiation, OPA (TOPAS Prime, Light Conversion Inc.) for probe radiation, AFM (NaniteAFM from Nanosurf AG) for topology investigation, STEM (JEM-2200FS from JEOL Ltd.) for visualization.
4：Experimental Procedures and Operational Workflow:
The sample was irradiated with a Gaussian-shaped spatial fluence distribution, and the optical response was measured using pump-probe metrology. The topology of the ablation structures was investigated post-irradiation.
5：Data Analysis Methods:
The data was analyzed using hydrodynamic modeling and compared with experimental results to understand the ablation mechanism.
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