Continuous gradient multilayer dielectric grating on sapphire substrate for high-power spectral beam combining
Year: 2025
Type: article
Abstract: Diffraction gratings employed in high-power spectral beam combining systems exhibit significant thermal effects under extreme laser irradiation. The resultant temperature rise on the grating surface degrades beam quality, posing a major challenge for enhancing system performance. This work uses a finite element model to simulate the temperature distribution on the grating surface under various laser irradiation conditions. A new grating design strategy is proposed, utilizing a highly thermally conductive sapphire substrate integrated with a continuous gradient multilayer dielectric grating (CGMDG) structure. Gratings fabricated based on this design demonstrate superior thermal stability. Experimental results show that the temperature increase on the grating surface remains below 1°C even under laser irradiation at power densities up to 71.66 kW/cm 2 .
Source: Optics Express
DOI: 10.1364/oe.579784
Authors: Zhongming Zheng, Wenhao Li, Wei Wang, Zheng Wu, Zhendong Chi, Yanxiu Jiang, Bayanheshig, Guangyong Jin
Language: English
Subfield: Surfaces, Coatings and Films
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
Awards: G5258210521, G7114364505
OpenAlex ID: W4415136723