Description
This is quartz cut specifically as the starting material for an optical component — a window, wafer, lens, or precision plate — where the grade and its OH content and transmission range are the primary specifications, not just the bulk dimension.
Dimensions
| Parameter | Range |
|---|---|
| Standard Diameter | Up to 200 mm |
| Large-Format Diameter | Up to 430–450 mm (large optical suppliers) |
| Thickness | Per drawing |
| Surface | As-cut, ground, or polished depending on next processing step |
Material Grades
| Grade | Production Method | OH Content | Transmission Range |
|---|---|---|---|
| JGS1 | Synthetic (SiCl₄), oxyhydrogen flame fusion | ~2000 ppm | 185 – 2500 nm; >90% at 185 nm |
| JGS2 | Natural quartz crystal, oxyhydrogen flame fusion | Moderate (lower than JGS1) | ~220 – 2500 nm |
| JGS3 | Natural/high-purity quartz sand, vacuum/electrofusion | Very low | 185/260 – 3500 nm; strong IR performance |
International-brand equivalents: JGS1 ≈ Heraeus Suprasil 1/2, Saint-Gobain Spectrosil; JGS3 ≈ Heraeus Suprasil 300.
Optical Quality
| Parameter | Specification |
|---|---|
| Refractive Index Homogeneity | ≤0.5 ppm achievable where required |
| Bubble Content | Free of inclusions on premium-grade material; bubble grade specified per 100 cm³ |
| Absorption Features | 245 nm absorption band (reduced glass/electric fusion characteristic); 2.73 µm (2730 nm) OH absorption peak on high-OH grades like JGS1 |
Production Route
- Raw boule/ingot selected for low inclusion and bubble content.
- Blank cut from the boule to target diameter/thickness.
- Shaping and polishing to the flatness and surface quality specification required for the finished optic.
Application
UV optics, excimer laser components, semiconductor equipment windows, and precision spectroscopy instruments (JGS1); general-purpose optical windows, sight glasses, and UV lamp envelopes (JGS2); high-temperature/IR-transmission optics and semiconductor diffusion equipment (JGS3).
What to Specify
| Parameter | Quotation Input |
|---|---|
| Blank Size | Diameter or L × W, plus finished / stock thickness |
| Quartz Grade | JGS1 / JGS2 / JGS3 or required transmission/OH specification |
| Surface State | As-cut, ground, or polished |
| Optical Quality | Homogeneity, bubble/inclusion grade, clear aperture and transmission requirement |
| Next Process | Window, wafer, lens, precision plate, or other downstream component |
FAQ
Which JGS grade should I choose?
JGS1 for deep-UV work below ~220 nm where the OH-driven transmission profile helps. JGS2 for general UV-visible optics at lower cost. JGS3 for infrared transmission and high-power laser applications where low OH matters. See the Quartz Glass Tubes Material Grades page for the fuller Type I–IV comparison alongside JGS1–3.
What’s the largest blank diameter available?
Standard optical-grade blanks run up to 200 mm; large-format suppliers can test/supply up to 430–450 mm diameter — confirm against your specific requirement.
Is the 2.73 µm absorption peak a problem for my application?
Only if your optical path passes through that wavelength — it’s a hydroxyl (OH) absorption feature most pronounced in high-OH grades like JGS1. If IR transmission matters, JGS3 (low OH) is the better starting grade.