Fused Silica (FS)

Fused Silica is a high purity synthetic amorphous silicon dioxide. This noncrystalline, colorless, silica glass combines a very low thermal expansion coefficient with excellent optical qualities and exceptional transmittance over a wide spectral range, especially in the ultraviolet. It is resistant to scratching and thermal shock. Fused silica is available in a number of grades for different applications. One of the important applications is High Energy Laser Optics. No other optical material matches the purity of fused silica and therefore its ability to withstand and transmit high energy laser pulses with limited absorption or damage to the material. Fused Silica is used for windows, lenses, and prisms in the transmission range 0.16mm to 3mm. Its refractive index varies from 1.55 to 1.40 through the transmission range.

UV grade Fused Silica Products: Prisms - Lenses - Windows - Beamsplitters
Available in stock - delivered within 48 hours!

Ultraviolet Grade Synthetic Fused Silica (KU1)                  Optical Grade Fused Quartz (KV)   

Full Spectrum Grade Synthetic Fused Silica (KI)      


Ultraviolet Grade Synthetic Fused Silica (KU1)

Base Properties

PARAMETER

VALUE

Refractive Index nf (486nm) = 1.4631; nd (588nm) = 1.4585; nc (656nm) = 1.4564
Birefringence Constant 3.54 (nm/cm)/(kg/cm2)
Abbe Constant 67.8
Bubbles/Inclusions none
Fluorescence Virtually fluorescence free
Impurity Content Total metallic impurities: approximately 5 ppm
OH- Content > 1000 ppm
Density 2.201 g/cm3
Specific Heat Capacity 703 J Kg-1K-1
Thermal Conductivity 1.38 Wm-1K-1
Coefficient of Expansion 0.55 x 10-6 /oC
Softening Point 1600oC (2912oF)
Annealing Point 1120oC (2048oF)
Strain Point 1025oC (1877oF)
Max. Service Temperature 950oC (1742oF) - continuous, 1200oC (2192oF) - limited time
Dielectric Constant 3.91 at 1kHz
Dielectric Strength 250-400 kV/cm at 20oC
Young's Modulus 73 GPa at 25oC
Shear Modulus 31 GPa at 25oC
Rupture Modulus 50 MPa at 25oC
Bulk Modulus 36.9 GPa at 25oC
Apparent Elastic Limit 55MPa (7980 psi)
Compressive Strength 1.1 GPa
Tensile Strength 50 MPa
Poisson Ratio 0.17 at 25oC
Knoop Hardness 500 kg/mm2
Molecular Weight 28.09
Class/Structure Amorphous glass
Chemical Stability High resistance to water and acids (except hydrofluoric).

Refractive Index

Wavelength, m

0.2

0.22

0.25

0.3

0.32

0.36

0.4

0.45

0.5

 
Refractive Index

1.55051

1.52845

1.50745

1.48779

1.48274

1.47529

1.47012

1.46557

1.46233

 
Wavelength, m

0.55

0.59

0.60

0.65

0.7

0.75

0.8

0.85

0.9

 
Refractive Index

1.46008

1.45846

1.45804

1.45653

1.45529

1.45424

1.45332

1.4525

1.45175

 
Wavelength, m

1.0

1.1

1.2

1.3

1.5

1.6

1.7

1.8

1.9

2.0

Refractive Index

1.45042

1.4492

1.44805

1.44692

1.44462

1.44342

1.44217

1.44087

1.43951

1.43809


Optical Grade Fused Quartz (KV)   

Fused silica is the glassy form of quartz and is thus isotropic. It is tough and hard and has a very low expansion. Normal varieties contain water which gives strong absorption in the IR. Water-free varieties are available

 

 

Base Properties

PARAMETER

VALUE

Refractive Index nf (486nm) = 1.4632; nd (588nm) = 1.4586; nc (656nm) = 1.4565
Reflection Loss 7.0% at 0.4 microns (2 surfaces)
Absorption Coefficient 10 x 10-6 cm-1 at 1 microns
dN/dT +11.9 X 10-6/C
dN/d = 0 1.3m
Birefringence Constant 3.61 (nm/cm)/(kg/cm2)
Abbe Constant 67.6
Fluorescence Upon excitation at 242 nm the material displays blue fluorescence.
Impurity Content Total metallic impurities: 25 - 30 ppm
OH- Content 400 - 500 ppm
Density 2.203 g/cm3
Thermal Conductivity 1.38 Wm-1K-1
Specific Heat Capacity 703 J Kg-1K-1
Coefficient of Expansion 0.55 x 10-6 /oC
Softening Point 1730oC (3146oF)
Annealing Point 1180oC (2156oF)
Strain Point 1075oC (1967oF)
Max. Service Temperature 1150oC (2102oF) - continuous, 1300oC (2372oF) - limited time
Dielectric Constant 3.91 at 1kHz
Dielectric Strength 250-400 kV/cm at 20oC
Young's Modulus 73 GPa at 25oC
Shear Modulus 31 GPa at 25oC
Rupture Modulus 50 MPa at 25oC
Bulk Modulus 36.9 GPa at 25oC
Poisson Ratio 0.17 at 25oC
Knoop Hardness 500 kg/mm2
Compressive Strength 1.1 GPa
Tensile Strength 50 MPa
Apparent Elastic Limit 55MPa (7980 psi)
Molecular Weight 28.09
Class/Structure Amorphous glass
Chemical Stability High resistance to water and acids (except hydrofluoric).

Full Spectrum Grade Synthetic Fused Silica (KI)

Base Properties

PARAMETER

VALUE

Refractive Index nf (486nm) = 1.4631; nd (588nm) = 1.4585; nc (656nm) = 1.4564
Birefringence Constant 3.54 (nm/cm)/(kg/cm2)
Abbe Constant 67.8
Bubbles/inclusions None
Fluorescence Virtually fluorescence free
Impurity Content Total metallic impurities: less than 0.3 ppm
OH- Content < 0.2 ppm
Density 2.201 g/cm3
Coefficient of Expansion 0.55 x 10-6 /oC
Softening Point 1600oC (2912oF)
Annealing Point 1120oC (2048oF)
Strain Point 1025oC (1877oF)
Max. Service Temperature 950oC (1742oF) -continuous, 1200oC (2192oF) -limited time
Dielectric Strength 250-400 kV/cm at 20oC
Young's Modulus 73 GPa at 25oC
Shear Modulus 31 GPa at 25oC
Rupture Modulus 50 MPa at 25oC
Bulk Modulus 36.9 GPa at 25oC
Poisson Ratio 0.17 at 25oC
Knoop Hardness 500 kg/mm2
Compressive Strength 1.1 GPa
Tensile Strength 50 MPa
Molecular Weight 28.09
Class/Structure Amorphous glass
Chemical Stability High resistance to water and acids (except hydrofluoric).

Refractive Index

Wavelength, m

0.2

0.22

0.25

0.3

0.32

0.36

0.4

0.45

Refractive Index

1.55051

1.52845

1.50745

1.48779

1.48274

1.47529

1.47012

1.46557

Wavelength, m

0.5

0.55

0.59

0.60

0.65

0.7

0.75

0.8

0.85

Refractive Index

1.46233

1.46008

1.45846

1.45804

1.45653

1.45529

1.45424

1.45332

1.4525

Wavelength, m

0.9

1.0

1.1

1.2

1.3

1.5

1.6

1.7

1.8

Refractive Index

1.45175

1.45042

1.4492

1.44805

1.44692

1.44462

1.44342

1.44217

1.44087

Wavelength, m

1.9

2.0

2.2

2.4

2.6

2.8

3.0

3.2

3.37

Refractive Index

1.43951

1.43809

1.43501

1.43163

1.42789

1.42377

1.41925

1.41427

1.4099

 

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