Comparison for Quartz Glass JGS1, JGS2, and JGS3

Quartz glass is an excellent basic optical material. It is divided into JGS1, JGS2, and JGS3 according to the application of different wavelength ranges. JGS1,Fused Silica is widely used in Laser substrate: lens, prism, telescope mirror. JGS2, Fused quartz, is one of the best cost-effective optical material for telescope mirror blanks. JGS3 is widely used in IR & UV substrates.

Quartz glass is a special industrial technical glass made from silica dioxide. It is an excellent basic material with a range of superior physical and chemical properties.Quartz glass is an excellent basic optical material which includes Fused silica JGS1,Fused quartz JGS2 and JGS3. JGS2, is one of the best cost-effective optical material for Astronomical mirror blanks and telescope mirror blanks.

1.High temperature resistance:
The softening point temperature of quartz glass is about 1730℃, and it can be used for a long time at 1100℃. The short-term high temperature can reach 1450℃.

2.Corrosion resistance:
Except for hydrofluoric acid, quartz glass hardly reacts chemically with other acid substances. Its acid resistance is 30 times that of ceramics and 150 times that of stainless steel. Particularly, its chemical stability at high temperatures is unmatched by any other engineering material.

3.Good thermal stability:
Thermal expansion coefficient: 0.58 x 10-6 /K (0℃ to 200℃). Quartz glass can withstand drastic temperature changes. It won't crack when heated to around 1100℃ and then put into room temperature water.

4.Good light transmission performance:
Quartz glass has good light transmission performance throughout the spectrum from ultraviolet to infrared. The visible light transmittance is above 93%, especially in the ultraviolet spectrum region, where the transmittance can be over 80%.

5.Optical homogeneity: < 8 x 10-6.

The commonly used fused quartz materials are divided into JGS1, JGS2, and JGS3, which are used for different wavelength ranges.

JGS1 typically used in the ultraviolet, visible, and near-infrared wavelength ranges. The material does not contain bubbles or impurities and can be used as a substitute for Suprasil 1 and Corning 7980.

JGS2 is usually used in telescope mirror substrates or blanks with a few small bubbles and can be used as a replacement for Homosil 1, 2&3.

JGS3 has good transmittance in the infrared, but contains many air bubbles, limiting its widespread use. It can be used to replace Suprasil 300.

Transmission curve：