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Home > Products > Windows > Fused Silica Windows

Fused Silica (SiO2) Windows

● Better performance from UV to IR spectrum than BK7 windows

● Transmission wavelength range from 0.185 to 2.1μm

Fused silica is the amorphous form of quartz crystal.  Advantages of fused silica material include the extremely good transparency from UV to IR, low coefficient of thermal expansion, large resistance to thermal shock over large temperature excursions, wide thermal operating range and high laser damage threshold.

Our fused silica windows are fabricated from high quality fused silica glass. Such as Corning HPFS 7980, 7979, 8655 and Heraeus 312, Chinese JGS1, JGS2, JGS3 etc. An extremely large range of thickness from 0.15 mm to 300 mm is achievable. Various high quality HR, AR, and partial reflective coatings are available upon request.

Specifications of fused silica windows:

Standard

Precison

Hi-precision

Material:

UV, IR grade Fused Silica (Corning 7980, Chinese JGS1, JGS2, JGS3)

Dimension Range:

Dia. 1.0mm to 300mm, 1x1mm to 300x300mm

Dia.1.0 to 150mm, 1x1mm to 150x150mm

Dimension Tolerance:

+/-0.05mm, +0/-0.1mm

+/-0.02mm, +0/-0.05mm

+/-0.01mm, +0/-0.02mm

Thickness Range:

>0.2mm

>0.5mm

>1mm

Thickness Tolerance:

+/-0.05mm

+/-0.02mm

+/-0.02mm

Surface Quality:

 60-40, 80-50 (MIL13830)

40-20

20-10, 10-5

Surface Accuracy:

1 lambda to 1/2 lambda per 25mm @633nm

1/4 lambda to 1/8 lambda 

per 25mm @633nm

1/10 lambda to 1/20 lambda

per 25mm @633nm

Parallelism:

1 arc min

30 arc second30 arc second

Chamfer:

protective, 0.2 to 0.5x45 Degree

Coating:

avaliable upon request

Transmission curve of Fused Silica:
Proterties of UV Grade Fused Silica (UVFS):
Transimission Range0.18 to 2.5um


Refractive Index1.46
Water absorption - saturation (%)0
Volume resistivity (Ohm.cm)1018@25 C
Compressive strength (Mpa)1100
Density2.202 g/cm3
Melting Point1715
Thermal Conductivity1.46 W m-1 K-1 @ 20 C
Themal Expansion Coefficientα = 0.54 x 10-6/K
Specific heat (J/K/kg)670-740 @ 25 C 
Hardness - Knoop (kgf/mm2)820
Hardness - Vickers (kgf/mm2)1000
Hardness - Mohs7
Thermo-Optic Coefficientsdn/dT= 1.0 x 10-5 /oC
Optical HomogeneityΔn < 10-6 /cm
Dielectric strength25-40 kV/mm
Dielectric constant3.8
Shear strength70 MPa
Tensile modulus72-74 GPa
Tensile strength48 Mpa
Apparent porosity (%)0
Upper continuous use temperature1100-1400 C
1. Fused Silica   2. Deep UV grade  3. Excimer UV  4. Infrared Grade

Typical applications:

    • UV-transparent optics
    • Applications with very high operating temperatures
    • Flame observation glass
    • Components for laser systems
    • UV-measurement technology
    • Chemical resistant windows
    • Windows for space applications
    • Semiconductor technology