Fused Silica (JGS1, 2, 3)
Fused silica (FS) is a widely used material with high chemical purity, good thermal expansion characteristics, a lower index of refraction as well as excellent homogeneity. Very good thermal expansion characteristic is an outstanding feature of fused silica.When compared to N-BK7, UV fused silica is transparent over a wider range of wavelengths (185 nm - 2.1 µm). It is scratch resistant and exhibits minimal fluorescence when exposed to wavelengths longer than 290 nm. Fused silica includes UV grade and IR grade.
Material Properties
Refractive Index of (nd)
1.4586
Abbe Number (Vd)
67.82
Typical index Homogeneity
< 8 x 10-6
Thermal Expansion Coefficient (CTE)
0.58 x 10-6/K (0℃ to 200℃)
Density
2.201 g/cm3
Transmission Regions & Applications
| Optimum Transmission Range | Ideal Applications |
| 185 nm - 2.1 μm | Used in interferometry, laser instrumentation, spectroscopy in the UV and IR spectrum |
Graph
The right graph is transmission curve of 10mm thick uncoated UV fused silica substrate
We default to use the Chinese equivalent material of fused silica, there are mainly three types of fused silica in China: JGS1, JGS2, JGS3, they are used for different application. Please view the following detailed properties respectively.
JGS1 is mainly used for optics in the UV and the visible wavelength range. It is free of bubbles and inclusions. It is equivalent to Suprasil 1&2 and Corning 7980.
JGS2 is mainly used as the substrate of mirrors or reflectors, as it has tiny bubbles inside. It is equivalent to Homosil 1, 2 & 3.
JGS3 is transparent in the ultraviolet, visible and infrared spectral regions, but it has many bubbles inside. It is equivalent to Suprasil 300.
Material Properties
Refractive Index of (nd)
1.4586 @588 nm
Abbe Constant
67.6
Thermal Expansion Coefficient (CTE)
5.5 x 10-7 cm/cm. ℃ (20℃ to 320℃)
Density
2.20 g/cm3
Chemical Stability (except hydrofluoric)
High Resistance to Water and Acid
Transmission Regions & Applications
| Optimum Transmission Range | Ideal Applications |
| JGS1: 170 nm - 2.1 μm | Laser substrate: windows, lenses, prisms, mirrors, etc. |
| JGS2: 260 nm - 2.1 μm | Mirrors substrate, Semiconductor and high temperature window |
| JGS2: 185 nm - 3.5 μm | Substrate in the UV and IR spectrum |
Graph
Transmission Curve of Uncoated JGS1 (UV Grade Fused Silica) Substrate
Transmission Curve of Uncoated JGS2 (Fused Silica for Mirrors or Reflectors) Substrate
Transmission Curve of Uncoated JGS3 ( IR Grade Fused Silica) Substrate
For more in-depth specification data, please view our catalog optics to see our complete selection of optics made from JGS1, JGS2, and JGS3.
