Top Trusted Fused Silica Window Manufacturer & Supplier

JGS1 is a synthetic grade manufactured from silicon tetrachloride (SiCl₄). It contains negligible metallic trace impurities (< 0.1 ppm total) and delivers exceptional deep-ultraviolet (DUV) transmission down to 185 nm, making it the industry benchmark for excimer lasers (193 nm, 248 nm), UV-curing lithography, and high-energy optics. JGS2 is produced by flame-fusing natural crystal sand; it transmits from 220 nm to 2500 nm and provides an economical option for industrial sight glasses, UV lamps, and general viewports. JGS3 is vacuum electrically fused, resulting in an exceptionally low hydroxyl (OH⁻) concentration (< 5 ppm). This eliminates the OH absorption band at 2.73 μm, enabling clear transmission out to 3500 nm in the mid-infrared spectrum.

The extraordinary thermal shock resistance of fused silica stems from its microscopic amorphous structure of tightly cross-linked SiO₄ tetrahedra, yielding an ultra-low linear Coefficient of Thermal Expansion (CTE) of approximately 5.5 × 10⁻⁷ / °C between 20°C and 300°C. This is roughly one-sixth the thermal expansion of borosilicate glass (32.5 × 10⁻⁷ / °C) and less than one-tenth that of standard soda-lime float glass. Consequently, uneven heating induces minimal localized dimensional expansion, keeping thermal stresses far below the fracture threshold. A fused silica window heated to 1100°C can be plunged directly into cold water without cracking.

For standard commercial and sight glass applications, we provide 60-40 scratch-dig with 1–2 λ flatness per inch. For precision optical and laser cavity windows, our double-sided pitch-polishing workshops routinely achieve MIL-PRF-13830B compliant 20-10 or 10-5 scratch-dig, surface roughness Ra < 0.5 nm (< 5 Å), optical flatness of λ/10 to λ/20 at 632.8 nm, and parallelism ≤ 10 arcseconds. Every high-precision window is verified via laser interferometry and delivered with an inspection certificate.

During high-temperature glassworking, hot bending, or rapid flame torch welding, localized thermal gradients create frozen-in molecular strains known as residual stress. When subjected to continuous mechanical pressure, chemical etching, or thermal cycling in the field, these internal stress nodes become crack nucleation centers, triggering unexpected catastrophic shattering. Lovri Quartz subjects 100% of finished quartz ware to computerized polariscopes (polarization stress testing) post-annealing to ensure optical path difference retardation remains below 5–10 nm/cm (Optical Class 1/2), ensuring fail-safe industrial durability.

Yes. Our CNC machining division accepts design files in DWG, DXF, STEP, IGES, and PDF formats. We operate precision multi-axis CNC milling centers equipped with diamond tooling, ultrasonic drilling, waterjet slicing, and edge-bevelling machines. We machine custom counterbored mounting holes, O-ring vacuum sealing grooves, stepped optical shoulders, precision inner/outer screw threads, multi-bore laser capillary profiles, and slotted semiconductor wafer boats with dimensional tolerances down to ±0.005 mm.

Because we are an authentic source manufacturer controlling our own material billets, our MOQ for custom optical windows, tubes, and wafer boats starts from just 1 to 5 pieces for prototyping and R&D engineering validation. Standard prototypes typically ship within 5 to 10 working days following engineering drawing sign-off. High-volume recurring production runs (thousands of units) benefit from dedicated tooling lines and expedited blanket order releases.

Fragile optics are cleaned in ultrasonic deionized baths and wrapped individually in lens tissue and anti-static, dust-free vacuum bags to prevent moisture contact or particulate contamination. Parts are nestled inside custom high-density CNC-molded polyethylene foam cavities within heavy-duty corrugated export boxes, which are then packed inside reinforced multi-layer plywood crates. Shock-watch sensors and tilt indicators can be applied for international air and ocean freight shipments.