Sapphire is a rhombohedral crystalline material. … “Orientation” refers to the angle of the sapphire crystal from its optical axis, also known as the C-axis. The C-axis of the sapphire crystal is the most commonly specified crystal orientation for sapphire windows.
What is a plane sapphire?
What Is A-Plane Sapphire? The plane that is perpendicular to the A-axis, containing the C-axis. A-plane Sapphire orientations are widely used in optoelectronic applications.
What is C cut sapphire?
C-axis sapphire, also referred to as C-plane sapphire or zero degree sapphire, provides high transmission from the ultraviolet (UV) to the mid-infrared, excellent chemical resistance, and high surface hardness second only to diamond.
What is the C-axis of a crystal?
The c-axis runs down the length of the crystal, and is perpendicular to the easy cleavage planes. … Tourmaline crystallises in the trigonal system, often in elongated crystals with striations along the length. The c-axis is then the long axis of the crystal.
What are sapphire windows?
What are Sapphire Windows? Sapphire is a synthetically grown super hard material that is extremely durable and resistant to scratches. It second only to diamond in terms of its strength. Sapphire windows can withstand more than what quartz and conventional glass can, and at a fraction of the thickness.
What does C axis mean?
[′sē ‚ak·səs] (crystallography) A vertically oriented crystal axis, usually the principal axis; the unique symmetry axis in tetragonal and hexagonal crystals. (geology)
Is Sapphire birefringent?
Sapphire is also “birefringent” which is an optical refractive property that offsets wave transmission up to 0.8% at right angles to the optic axis. Birefringence is eliminated along the optic or C-axis of the crystal.
What is the crystal structure of sapphire?
Hexagonal crystal system
What orientation is C?
C-Axis: In a rod, the direction along its length. In a window, the direction perpendicular to the face.
What are the 7 crystal systems?
They are cubic, tetragonal, hexagonal (trigonal), orthorhombic, monoclinic, and triclinic. Seven-crystal system under their respective names, Bravias lattice.
What is a birefringent material?
Birefringence is the optical property of a material having a refractive index that depends on the polarization and propagation direction of light. These optically anisotropic materials are said to be birefringent (or birefractive).
What is the visual axis?
The optical axis is composed of an imaginary line perpendicular to the cornea that intersects the center of the entrance pupil.(1) In comparison, the visual axis is an imaginary line that connects the object in space, the center of the entrance and exit pupil, and the center of the fovea.(1) The visual axis has also …