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Continuous gradient multilayer dielectric grating on sapphire substrate for high-power spectral beam combining
Optics Express
|December 19, 2025
Summary
New diffraction gratings with a sapphire substrate and continuous gradient multilayer dielectric grating (CGMDG) structure show excellent thermal stability. This design minimizes temperature increases under high-power laser irradiation, improving spectral beam combining system performance.
Area of Science:
- Optics and Photonics
- Materials Science
- Laser Technology
Background:
- High-power spectral beam combining systems utilize diffraction gratings.
- Extreme laser irradiation causes significant thermal effects on grating surfaces.
- Temperature rise degrades beam quality, limiting system performance.
Purpose of the Study:
- To investigate thermal effects on diffraction gratings under high-power laser irradiation.
- To propose and validate a novel grating design for enhanced thermal stability.
- To improve the performance of spectral beam combining systems.
Main Methods:
- Finite element modeling was used to simulate temperature distribution.
- A new grating design integrating a sapphire substrate with a continuous gradient multilayer dielectric grating (CGMDG) structure was developed.
- Fabrication and experimental testing of the novel gratings were performed.
Main Results:
- The proposed CGMDG structure demonstrated superior thermal stability.
- Simulations predicted temperature distribution under various irradiation conditions.
- Experimental results showed a temperature increase below 1°C at power densities up to 71.66 kW/cm².
Conclusions:
- The novel grating design significantly enhances thermal stability in high-power laser systems.
- Sapphire substrates and CGMDG structures effectively mitigate thermal degradation.
- This advancement enables higher performance in spectral beam combining applications.
