JGS1 is a grade of "far-ultraviolet optical fused silica," a high-purity synthetic fused quartz with extremely low metal impurity content and extremely low OH content (< 10 ppm), resulting in negligible infrared water absorption bands. Its key advantages are excellent deep-UV transmittance, high purity, and a high laser-induced damage threshold, making it suitable for precision optical applications in the deep-UV, visible, and near-infrared ranges from 185 nm to 2500 nm.
Extremely high UV transmittance
Excellent optical homogeneity
No color center formation under deep-UV exposure
| Comparison Item | JGS1 | JGS2 | JGS3 |
| Material Type | Synthetic fused silica (high hydroxyl) | Synthetic fused silica (low hydroxyl) | Natural fused silica (ultra-low hydroxyl) |
| UV Transmittance | Best deep UV performance | Good mid-UV performance | Weak UV transmittance |
| Infrared Transmittance | Strong infrared absorption | Good infrared transmittance | Optimal infrared transmittance |
| Typical Transmission Band | 185nm - 2500nm | 220nm - 3000nm | 260nm - 3500nm |
| 193 / 248 nm Deep UV | Applicable (lithography / UV instruments) | Not suitable for deep UV | Not applicable |
| Laser Resistance | Conventional UV laser | Stable for UV & visible laser | Preferred for high-power infrared laser |
| Thermal Stability | Excellent | Superior | Top-tier, high temperature aging resistance |
