fused silica step window

Fused silica or fused quartz has good thermal stability. Fused silica lenses or fused quartz lenses have excellent properties and chemical purity. They have excellent transmission and adapt to high operating temperatures. These fused silica lenses are the first choice in many areas of laser and imaging applications, especially those used in UV wavelength regions.

He Rui Optics can produce various of high-quality fused silica lenses made from UV grade fused silica glass and IR grade fused silica glass. 

Commonly available materials are Chinese JGS1, JGS2, JGS3, Corning 7980, 7979,8655 ，SK1300, SK1310 and so on.

Corning 7980 is high purity non crystalline silica glass that features very low refractive index variations. It has exceptional transmittance from deep ultraviolet through the infrared region.  Homogeneity is certified both in use-axis AA, A, C, F as well as off-axis.  At 589.3nm, the index of refraction is 1.45840. Density is 2.20 g/cm3, and Knoop hardness 522 kg/mm. The tensile strength is 54 MPa at 25 degrees Celsius.

Heraeus fused silica is available in different options for applications in UV, IR, Vis, or broadband spectrum. This noncrystalline isotopic glass is produced with the highest standards in purity and substrate homogeneity.

JGS1 is suitable for transmission deep into the UV range. This ultraviolet grade fused silica, a synthetic amorphous silicon dioxide, is equivalent to Corning 7950 or Heraeus Suprasil 1 and 2. It has no absorption bands in the 170-250 nm interval, but does have an intensive OH absorption band in wavelength 2600-2800 nm. It is a high quality glass with practically no bubbles or inclusions.

JGS2 is suitable for light transmission between 220 and 2500nm. It is widely used in the solar industry and for semiconductors. It has only tiny bubbles, but more than JGS1. OH content is about 120 ppm.