What is the Processing Form of Optical Glass?
Aug. 18, 2020
As a Professional Optical Dome Manufacturer, share with you. In order to
produce high quality optical glasses with uniformity, special preventive
measures must be taken. First use fairly pure raw materials and equipment, which
are carefully designed to avoid pollution of harmful substances. Typically,
block glass is made by filling a certain amount of glass melt into bulk, then
placing it in molten form for a period of time to settle, and then slowly
cooling it to solidification at a carefully controlled rate. Slow cooling allows
annealing, that is, reducing internal mechanical stress. Very slow and
well-defined annealing stages are important, especially for bringing
stress-induced birefringence to very low levels, as well as for reaching
constant refractive index values. Precision optical glass is usually provided in
the form of fine annealed glass, with a reference annealing rate of K /h.2, for
Glass Optical Domes
Other forms of supply of raw optical glass are large strips and rods that can be used to make optical components such as lenses or prisms. Some optical glass suppliers also provide processed forms, such as plates, cut prisms, or pressed blanks.
A wide variety of glass materials have been optimized for optical applications. Usually, inorganic glass is used in this paper. The article on plastic optics introduces plexiglass, which is gradually replacing inorganic glass in some applications, mainly because it can be used in low-cost manufacturing technology.
Inorganic glass materials commonly used
Inorganic glass is made by mixing certain compounds, melting them and curing them slowly (but not too slowly) to obtain amorphous materials. more details about glass fabrication.
Fused quartz and silicate glass
Silica (amorphous silica, SiO2) is widely used as a pure substance (→ fused silica, fused silica) for optics or, more often, mixed with other compounds (silicate glass) for use.
Fused silica usually has high chemical purity and very favorable properties, such as wide transparency range from uv to ir region (depending on material purity), low optical nonlinearity, low thermal expansion coefficient, high mechanical strength and high chemical stability stability. Because of its very high curing temperature, it can run at very high temperature, but it is also difficult to process.
Although the infrared transmittance of high-purity fused silica may be very good, silicate glass usually exhibits obvious absorption peaks due to the influence of impurities, such as impurities. Water absorption peak.
Mixing with other compounds produces related materials, such as borosilicate, aluminosilicate, germanium silicate, etc. generally, silica remains the main component.
Most fibers are based on silica and are therefore called silica fibers. Usually, the fiber cladding material is pure silica, while the fiber core is made of germanium silicate or germanium aluminosilicate.
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