
The Optical Transparency of Sapphire Windows and Its Engineering Significance
Sapphire, a form of single-crystal aluminum oxide (Al₂O₃), is well-known for its exceptional hardness and thermal stability, making it a popular material in a variety of high-performance applications. One of the most remarkable properties of sapphire, however, is its optical transparency, which extends across a wide range of wavelengths—from ultraviolet (UV) through visible light to







