Confused? What is JGS1, JGS2, JGS3 in Optical Quartz Glass, how to select the optical quartz material in your optical system?
Fused silica is the glassy form of quartz and is thus isotropic. It is tough and hard and has a very low expansion. Normal varieties contain water which gives strong absortion in the IR. Water-free varieties are available. There are different types Fused Silica used for different application. We mainly have three types, including JGS1, JGS2, JGS3.
1. (Far UV Optical Quartz Glass) JGS1
It is an optical quartz glass made of synthetic stone with SiCl 4 as raw material and melted by high purity oxyhydrogen flame. So it contains a large amount of hydroxyl (around 2000 ppm) and has excellent UV transmission performance. Especially in the short wave UV region, its transmission performance is far better than all other kinds of glass. The UV transmission rate at 185nm can reach 90% or more. The synthetic quartz glass get very strong absorption peak at 2730 nm and has no particle structure. It is an excellent optical material in the range of 185-2500nm.
JGS1 is used for optics operating in the deep UV and the visible wavelength range
- Laser
- Lenses
- Windows
- Prisms
- Mirrors, etc.).
It is practically free of bubbles and inclusions.
JGS1 Fused Silica is similiar to the following Manufacturers
Heraeus – Suprasil 1 and 2 Saint-Gobain – Spectrosil A and B Corning’s 7980 Dynasil’s 1100 and 4100
2. (UV Optical Quartz Glass) JGS2
It is quartz glass produced by gas refining with crystal as raw material, containing dozens of PPM metal impurities. There are absorption peaks (hydroxyl content 100-200ppm) at 2730nm, with stripe and particle structure. It is a good material in the wave band range of 220-2500 nm. The benefits include good UV and visible transmission similar to JGS1. Can be made in small diameters/dimensions that can be very thin and is free of bubbles. Cons include possible bubbles in larger dimensions/diameters.
JGS2 Fused Silica is similiar to the following Manufacturers
Heraeus’ Homosil 1,2; 3
Dynasil 1000; 4000; 5000; 6000
Applications for JGS2 include:
- condenser optics
- high temperature and pressure devices
- optical flats
- microscope slides
- sight glasses
3. (Infrared Optical Quartz Glass) JGS3
JGS3 is transparent in the ultraviolet, visible and infrared spectral regions. It’s absorption bands are in the 185-250 nm spectral region, but has no absorption bands in the visible physical properties with outstanding optical characteristics in the deep UV and the IR wavelength range. It is those requiring very wide wavelength range from DUV to MIR. It is quite a bit more expensive than Silicon and slightly less expensive than Calcium Fluoride or ZnS Multi-spectral grade.
JGS3: is similiar to the following manufacturers
Heraeus Suprasil 300.
Shape Optics can provide optical grade Quartz Glass for many applications, including bandpass interference filter, Cut off filters, UV bandpass filter, Narrow bandpass filter, ND filter, Negative Filter or Notch filters, dichroic, color substrate.
