
Material Selection for Optical Systems: A Detailed Comparison Between Sapphire and BK7 (K9 Glass)
Optical materials are fundamental to modern photonic and imaging systems, spanning applications from consumer electronics to aerospace instrumentation. Among the most widely used materials are Sapphire Optical Windows and BK7 Glass (also known as K9 glass in China). Despite their broad usage, these materials differ significantly in crystal structure, optical behavior, mechanical strength, and manufacturing








