Through its collaboration with Fusion for Energy (F4E), Polyteknik AS has developed advanced rhodium-coated mirrors for ITER optical diagnostics. These plasma-facing “first mirrors” are designed to preserve high optical performance while operating under extreme conditions such as radiation, deposition, corrosion, and restricted maintenance access. Originally developed for ITER, this coating capability is also relevant for other demanding optical applications requiring durable, high-reflectivity surfaces in harsh environments.

Main advantages and potential applications

• High-performance rhodium coatings for plasma-facing optical mirrors
• Precise thickness control and uniform deposition, including curved surfaces
• Low surface roughness and high crystallinity to preserve optical quality
• Increased coating thickness compatible with plasma self-cleaning technologies
• High resistance to erosion, oxidation, corrosion, and long-term degradation
• Suitable for fusion diagnostics, big science facilities, vacuum-based optical systems, and advanced scientific instrumentation