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Fused Silica window/wafer

Fused Silica window/wafer

Click here for: Quartz(SiO2) single crystal substrate/wafer

  Fused Silica optical window


Fused Silica Quartz (SiO2) glass

Other Names

Fused Quartz window, Quartz glass window, Fused Silica wafer

Grade / Application band

JGS1 (VUV grade), Can be used in 180~2500nm wave band
JGS2 (UV grade), Can be used in 220~2500nm wave band
JGS3 (IR grade), Can be used in 700~3500 wave band

Refractive index

1.47012 at 4um

Specific heat

703 J/kg. ℃
Thermal conductivity

1.38 W/m. ℃

Thermal expansion coefficient

0.55 x 10E-6 /℃ at 300K

Moh's hardness

5.5 ~ 6.5

Compressive strength

1100 Mpa

Young's modulus

73.1 Gpa

Shear modulus of elasticity

31.2 Gpa

Apparent elastic limit

55 MPa(7980 psi)

Material Standard Size Surface quality
Fused Silica windows

(VUV grade, JGS1) or
(UV grade, JGS2) or
(IR grade, JGS3)
φ25mm x 2.0mm
φ25.4mm x 0.5mm
φ50mm x 1.0mm
φ50.8mm x 1.0mm
φ100mm x 0.5mm
φ100mm x 3.0mm
25 x 25 x 1.0mm
50 x 50 x 1.0mm
100 x 100 x 0.5mm

Or others
Polishing:             Double side optical polished
Surface Finish:      60-40, 40-20, 20-10 (scratch-dig)
Roughness:          Ra<1.5nm or Ra<10nm or Ra<0.5nm
Size Tolerance:          +/-0.1mm
Thickness Tolerance: +/-0.1mm or +/-0.05mm
Parallelism:           3 minutes,1 minute, 30 seconds or higher
Surface flatness:    1/2λ, 1/4λ or higher
Chamfer:                0.25mm × 45°


Fused Silica Quartz glass window is smelted by high purity(>99.99%) of Quartz(SiO2) material, the Fused quartz glass can be used as precision optical elements in the industrial photoelectric field. Quartz glass window can work for a long time at a high temperature of 1200 °C, and is resistant to abrasion and acid and alkali (except HF).

The JGS1 of Fused Silica has high transmittance(>90%) in 180~2500nm wave band, it is used as VUV window. 
The JGS2 of Fused Silica has high transmittance(>90%) in 220~2500nm wave band, it is used as UV window. 
The JGS3 of Fused Silica has high transmittance(>90%) in 700~3500nm wave band, it is used as IR window. 

We can customize different size and thickness of Fused Silica optical window upon requirements, such as Fused Silica round wafer, Square substrate and Cylinder, or Punch holes and other shapes.

Contact Us

  • Tel: (+86) 1506 0796 451
  • Fax: (+86) 0597 2212602
  • Email:
  • Work Time ( GMT +8 ):
  •    9 AM ~ 6 PM, Monday to Friday
  • Main office: A7, No. 501, Denggaoxi Road, Xipi street, Xinluo District, Longyan, Fujian, China