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Femtosecond laser-induced concentric ring damage patterns on fused silica surfaces
Optics Express
|February 20, 2026
Summary
Researchers developed a model to understand femtosecond laser-induced ring structures on fused silica. Simulations and experiments show concentric rings forming due to electron dynamics and interference patterns.
Area of Science:
- Materials Science
- Laser Physics
- Surface Science
Background:
- Femtosecond lasers induce complex surface structures.
- Understanding the formation of concentric rings is crucial for laser microstructuring.
Purpose of the Study:
- To investigate the formation of radially concentric ring structures on fused silica surfaces.
- To develop a predictive model for femtosecond laser-material interactions.
Main Methods:
- Developed a coupled interference-electron-dynamics model.
- Incorporated Gaussian pulse profile, ionization rate equations, and Drude formulation.
- Reconstructed surface energy and electron density evolution.
Main Results:
- Simulations generated concentric interference rings with spacing decreasing from the center.
- Experiments confirmed similar ring structures and spacing patterns.
- The model accurately predicts ring spacing and formation dynamics.
Conclusions:
- The coupled model provides a practical tool for analyzing femtosecond laser irradiation.
- This framework aids in predicting optical driving patterns and ring metrics.
- Supports the design of advanced femtosecond laser microstructuring strategies.
