What is optical grade sapphire?
What is optical grade sapphire?
Esco works with only high quality, optical grade sapphire. It is essentially 100% pure. The various properties of sapphire are a function of the direction within the crystal with respect to the optic axis. It has an extremely wide transmission spectrum (150 nm to 6.0 µm).
What are two physical properties of a sapphire?
Physical Properties:
- Density: 3.98 g/cm3, (0.143 lbs./in3)
- Hardness: Knoop microindenter: 1800 FACE perpendicular to c-axis, 2200 FACE parallel to c-axis.
- Young’s Modulus: 400 GPa @ 20°C.
- Tensile Strength: 300 to 400 MPa.
- Point Group; Symmetry: 3 2/m; [C,1A3, 3A2, 3P]
What are the physical properties of a sapphire?
Physical/Mechanical
| Properties | Value |
|---|---|
| Flexural Strength | 1035 MPa (150 kpsi) parallel to C-axis (25°) 760 MPa (110 kpsi) perpendicular to C-axis (25°) |
| Compressive Strength | ≈2 GPa (300 kpsi) (25°) |
| Hardness | 9 on Mohs scale (between 20° and 25°C) 1900 Knoop parallel to C-axis 2200 Knoop perpendicular to C-axis |
What is fused silica glass used for?
Fused silica and quartz are used in the manufacture of many optical parts—such as lenses, mirrors, UV and IR transmitting optics, and metrology components—due to their ability to transmit light in the visible, ultraviolet, and infrared range. Semiconductors.
What is C plane sapphire?
“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. Other orientations that are less frequently requested include M-Plane, R-Plane, and A-Plane.
What is the refractive index of sapphire?
1.76 – 1.77
Sapphire/Refractive index
What are chemical properties of sapphire?
Sapphire Properties
| Mineral Class | Corundum |
|---|---|
| Chemical Formula | Al2O3 |
| Crystal System | Hexagonal and trigonal |
| Colours | Blue, pink, purple, yellow, green, orange, colourless, grey, black and multicoloured |
| Hardness | 9.00 on the Mohs scale |
What minerals are in sapphire?
Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide (α-Al2O3) with trace amounts of elements such as iron, titanium, chromium, vanadium, or magnesium.
Is sapphire glass conductive?
Synthetically produced Sapphire crystals also have high thermal conductivity, up to 40 times more than glass. With a melting point of over 2000°C, its strength is five times that of glass and due to its purity and transparency it can be used as viewing window in high pressure and vacuum applications.
Is fused silica an insulator?
Fused silica is a good electrical insulator, retaining high resistivity at elevated temperatures and excellent high-frequency characteristics.
What is the difference between silica and silica glass?
The main difference between the two is that Fused Silica is composed of a non-crystalline silica glass, while Quartz is made from crystalline silica. This difference gives Fused Silica very high transmission in the UV spectrum compared to that of Quartz.
What is the crystal structure of sapphire?
Hexagonal crystal system
Sapphire/Crystal system
What are the optical properties of fused silica?
The optical properties of fused silica offer striking opportunities for research and industry: the broad transparent transmission range covers the complete visible spectrum and extends far into the infrared and ultraviolet regions. Transmission can be influenced by material purity and the method of manufacture.
What is fused silica glass?
Fused silica is a purer version of fused quartz that is made from various silicon gasses. Chemically known as SiO2, silica is “pure” glass. All other commercial glasses are SiO2 with other dopants added to lower the melting temperature and modify optical, thermal and mechanical characteristics. WHY FUSED QUARTZ AND FUSED SILICA GLASS?
Why are glass and Sapphire colorless?
Both crystalline solids and glasses are normally colorless in the pure state. Impurities are actually what give sapphire and glass their color. The impurities also change the mechanical, thermal, and optical properties of both material types, especially for glass. Why/why not sapphire? Why/why not fused and synthetic quartz?
What is the difference between fused quartz and fused silica?
Fused quartz and fused silica are the amorphous form of quartz. Fused quartz is made from purifying and melting natural crystalline quartz, usually natural quartz sand. Fused silica is a purer version of fused quartz that is made from various silicon gasses. Chemically known as SiO2, silica is “pure” glass.
