Optical sapphire round window
The window is a parallel plane plate, usually used as a protective film for electronic sensors or external environment detectors. When choosing a window, the user should consider whether the transmission properties of the material and the mechanical properties of the substrate are consistent with the application requirements. The window does not change the magnification of the system. We offer windows on various substrates, including germanium (Ge), silicon (Si), N-BK7, UV fused silica, zinc selenide (ZnSe) or potassium bromide (KBr). Our multiple optional antireflection coatings can be applied to ultraviolet, visible or infrared spectroscopy.
Size: Φ50.8mm~Φ500mm×Thickness 0.1mm~20~30mm;
The composition of sapphire is aluminum oxide (Al2O3), which is formed by covalent bonding of three oxygen atoms and two aluminum atoms, and its crystal structure is a hexagonal lattice structure. It is often applied to the cut surface of A-Plane, C-Plane and R-Plane. Because the optical transmission band of sapphire is very wide, it has good light transmission from near ultraviolet light (190nm) to mid-infrared. Therefore, it is It is widely used in optical components, infrared devices, high-strength laser lens materials and mask materials. It has the characteristics of high sound velocity, high temperature resistance, corrosion resistance, high hardness, high light transmittance, and high melting point (2045°C). It is A material that is quite difficult to process, so it is often used as a material for optoelectronic components. At present, the quality of ultra-high-brightness white/blue LEDs depends on the material quality of gallium nitride epitaxy (GaN), and the quality of gallium nitride epitaxy is closely related to the surface processing quality of the sapphire substrate used. Sapphire (single crystal Al2O3) C The lattice constant mismatch rate between theⅢ-ⅤandⅡ-Ⅵgroup deposited films is small, and it meets the high temperature resistance requirements in the GaN epitaxial process, making the sapphire chip a key material for white/blue/green LED .
The following pictures are the cross-sectional view of the sapphire; the top view of the crystal structure; the side view of the crystal structure; the structure of Al2O3; the schematic diagram of the sapphire crystal surface:
