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Defect-Coating-Wavelength Coupling Effects on Nano-Scale Electric Field Modulation in Fused Silica Under
Hongbing Cao1,2,3, Xing Peng1,2,3, Feng Shi1,2,3
1College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China.
Nanomaterials (Basel, Switzerland)
|November 12, 2025
Summary
Multi-wavelength lasers interacting with antireflection (AR) coatings on fused silica can cause electric field hotspots near surface defects. Optimizing AR coatings for specific wavelengths is crucial for enhancing the reliability of high-power laser systems.
Area of Science:
- Optics and Photonics
- Materials Science
- Laser Physics
Background:
- Fused silica optical components with antireflection (AR) coatings are vital for high-power laser systems.
- Reliability is compromised by multi-wavelength irradiation and surface defects.
- Understanding electric field modulation is key to improving component durability.
Purpose of the Study:
- To investigate the coupling effects of electric field modulation between multi-wavelength irradiation, AR coating layers, and defects in AR-coated fused silica.
- To analyze the impact of different scratch geometries on field distribution under multi-wavelength conditions.
Main Methods:
- Utilized the finite-difference time-domain (FDTD) method for nanoscale electric field intensity simulation.
- Simulated fused silica with a double-layer AR coating under three different design wavelengths using multi-wavelength lasers.
- Analyzed electric field coupling effects for three representative scratch geometries.
Main Results:
- Matching incident wavelength to AR design wavelength suppressed interface fields, creating smoother distributions and fewer hot spots.
- Mismatched wavelengths caused severe field distortion, multiple hot spots, and lateral interference fringes.
- Wide, shallow scratches showed high sensitivity to wavelength mismatch; a 532 nm AR coating amplified 355 nm light by a factor of 1.63442.
Conclusions:
- Scratch geometry, AR coating dispersion, and laser wavelength significantly influence electric field modulation.
- Findings provide insights for optimizing AR coatings and defect tolerance in multi-wavelength laser applications.
- This research contributes to improving the reliability of high-power laser systems.
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