宽波段光栅国内外研究综述

Key Points

• The aim is to summarize the developments in wide-bandwidth diffraction gratings both domestically and internationally.
• Reviewed advances in four types of wide-bandwidth gratings: complex groove, partitioned, medium-step, and multilayer dielectric gratings.
• Analyzed characteristics such as spectral continuity, diffraction efficiency, design flexibility, and manufacturing challenges.
• Complex groove gratings exhibit high spectral continuity and stable diffraction efficiency, but are sensitive to manufacturing precision.
• Partitioned gratings offer high design flexibility and mature processing technology, though suffer from phase mismatch issues.
• Medium-step gratings can achieve high-resolution response at high diffraction orders but are difficult to produce accurately.
• Multilayer dielectric gratings are highly adaptable but have demanding material and layer thickness requirements.