Characteristic of Glass Materials

Ultiquest Technology is capable of fabricating a wide variety of optical components with various optical materials. The most important material properties to consider for an optical element are transmission versus wavelength, index of refraction, thermal characteristics, mechanical and chemical characteristics and cost.

To select the right materials seems overwhelming. The simplest way is to let Ultiquest Technology engineers know your applications, and we select them for you.

 
Borosilicate Crown Glass (BK7)--------------------------------
Borosilicate Crown Glass is used for windows, lenses, and prisms where transmission in the range 0.4m to 1.4m is desired. The refractive index varies from about 1.53 to 1.5 through this range. It is used for thermally non-critical applications.
Property Specification
Transmission Range 0.4-2.5m
Density 2.51 g/cc
Thermal Expansion Coefficient 7.1x10-6/K @ -30 to +70C, and 8.3x10-6/K @ 20C to 300C
Surface Finish BK7 polishes extremely well and polishes of 10-5, or 20-10 scratch-dig are achieved at extra costs respectively, mainly for UV and visible applications.
Surface Figure Surface figure of 1/10 wave to 1/4 wave @0.6328m are specified mostly on lenses
for ultraviolet and visible use.
AR Coating Options AR @ 0.8-2.5m, AR @ 1.064, AR @ Visible W.L.
Typical Applications Astronomical, Thermal Imaging
Products Manufactured Lenses, Windows, Wedges, Prism, BeamSplitters, Filters.
   
Optical Transmittance Curve of BK7 (Reference Data):
BK7 Transmittance
 
Fused Silica (UV Grade)------------------------------------- -----
Fused silica is often used in near infrared systems performing in the 0.8-2.5m spectral region. It is also frequently used at the popular 1.064m Nd:YAG laser wavelength.

The material has high homogeneity and good transmission in the visible and near infrared spectral regions. Cost of the material ranges widely by type and purity. However the most common Fused Silica for infrared use is quite a bit more expensive than Silicon and slightly less expensive than Calcium Fluoride or ZnS Multi-spectral grade. Due to the materials inherently hard SiO2 amorphous structure, the material is not diamond turnable. Typical specifications for surface quality in the near infrared regions are a 40-20 scratch dig.
Property Specification
Transmission Range 0.18m to 2.5m
Density 2.202g/cm3
Thermal Expansion Coefficient 5.5x10-7 / C@20 to 320C
Surface Finish Fused Silica polishes extremely well and polishes of 10-5, or 20-10 scratch-dig are achieved at extra costs respectively, mainly for UV and visible applications.
Surface Figure Surface figure of 1/10 wave to 1/4 wave @0.6328 m are specified mostly on lenses
for ultraviolet and visible use.
AR Coating Options Typical available infrared coatings are a BBAR from 0.8- 2.5 m and an AR coating for 1.064 m wavelength.
Typical Applications Thermal imaging, Astronomical,Microlithography, Excimer laser applications, Nd:YAG laser applications.
Products Manufactured Lenses, Windows, Wedges, Prism, BeamSplitters, Filters.
 
Optical Transmittance Curve of UV Fused Silica (Reference Data):
UV fused Silica Transmittance
 
Fused Silica (IR Grade)------------------------------------- -----
Fused silica is often used in near infrared systems performing in the 0.8-2.5m spectral region. It is also frequently used at the popular 1.064m Nd:YAG laser wavelength.

The material has high homogeneity and good transmission in the visible and near infrared spectral regions. Cost of the material ranges widely by type and purity. However the most common Fused Silica for infrared use is quite a bit more expensive than Silicon and slightly less expensive than Calcium Fluoride or ZnS Multispectral grade. Due to the materials inherently hard SiO2 amorphous structure, the material is not diamond turnable. Typical specifications for surface quality in the near infrared regions are a 40-20 scratch dig.
Property Specification
Transmission Range 0.25m to 3.5m
Density 2.202g/cm3
Thermal Expansion Coefficient 5.5x10-7 / C@20 to 320C
Surface Finish Fused Silica polishes extremely well and polishes of 10-5, or 20-10 scratch-dig are achieved at extra costs respectively, mainly for UV and visible applications.
Surface Figure In the infrared, typical surface figure ranges from 1/4 wave to 2 waves @0.6328m and are specified depending on the system performance requirements.
AR Coating Options Typical available infrared coatings are a BBAR from 0.8- 2.5m and an AR coating for 1.064m wavelength.
Typical Applications Thermal imaging, Astronomical,Microlithography, Excimer laser applications, Nd:YAG laser applications.
Products Manufactured Lenses, Windows, Wedges, Prism, BeamSplitters, Filters.
 
Optical Transmittance Curve of IR Fused Silica (Reference Data):
ir fused silica Transmittance

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