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Laser damage prediction under composite multi-wavelength irradiation based on field-thermal-stress coupled model
Optics Express
|February 20, 2026
Summary
This study models laser-induced damage in multilayer films using a coupled field-thermal-stress approach. Results show asymmetric front and rear surface damage, dependent on laser energy ratios, validating the predictive model.
Area of Science:
- Materials Science
- Optical Engineering
- Laser Physics
Background:
- Laser-induced damage in optical materials is a critical concern for high-power laser systems.
- Understanding damage mechanisms in multilayer films is essential for improving device reliability.
- Previous models often lack the coupled field-thermal-stress analysis required for complex irradiation scenarios.
Purpose of the Study:
- To establish an analytical model for laser-induced damage in multilayer films under dual/multi-wavelength irradiation.
- To investigate the influence of varying energy ratios of fundamental harmonic (1ω) and third harmonic (3ω) laser light on damage.
- To predict and differentiate damage types on the front and rear surfaces of the film.
Main Methods:
- Development of a coupled field-thermal-stress analytical model.
- Simulation of laser-induced damage under different energy ratios of 1ω and 3ω.
- Experimental validation using microscopy and Raman spectroscopy to analyze damage morphologies and material changes.
Main Results:
- Asymmetric damage observed on the front and rear surfaces of the multilayer film.
- Front surface damage transitions from field-induced to nanoscale fracture (field-stress coupling) as 1ω ratio decreases.
- Rear surface damage consistently shows micrometer-scale remelted structures (thermal-stress coupling), irrespective of energy ratio.
Conclusions:
- The established analytical model accurately predicts laser-induced damage types and morphologies in multilayer films.
- The findings highlight the critical role of energy ratios in determining damage mechanisms and locations.
- The model's reliability is confirmed through strong agreement with experimental observations and spectral analysis.
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