Beryllium mirrors:

https://Www.photonics.com/EDU/Handbook.aspx?AID=25113 Beryllium are finding commercial applications, while maintaining their military and space applications. Refinements in design and improvements in manufacturing technology have cut costs and new coatings have enabled high-power applications allowing a three-fold increase in manufacturing process speeds and economics. VLADIMIR VUDLER AND PETER RICHARD, HARDRIC LABORATORIES, INC. With a specific gravity of 1.85 g/cm3, … Continue reading Beryllium mirrors: