China Top Optical Quartz Window Manufacturers & Exporter

The selection is governed strictly by the operating wavelength and laser power intensity of your optical system. If your application involves Deep UV (such as 193 nm ArF or 248 nm KrF excimer lasers, spectrophotometry, UV curing, or semiconductor lithography), JGS1 Synthetic Fused Silica is required because it delivers over 90% internal transmittance down to 185 nm without solarization or fluorescence. If your application operates across the visible spectrum (380–780 nm) or requires standard thermal furnace sight glasses where cost is a factor, JGS2 Optical Fused Quartz provides high thermal shock resistance and broad visible transmission. If you require infrared pyrometry, gas sensing, or fiber optic transmission spanning 1.5 μm to 3.5 μm, JGS3 is required due to its low hydroxyl ([OH⁻] < 5 ppm) content, which eliminates the large water absorption dip at 2730 nm.

Transparent fused quartz exhibits a high softening point of approximately 1730°C and an annealing point around 1215°C. For continuous operation, optical quartz can sustain temperatures up to 1100°C without mechanical degradation or devitrification. For short exposure durations, it withstands thermal spikes up to 1300°C. Its extremely low coefficient of thermal expansion (CTE ≈ 5.5 × 10⁻⁷ /°C from 20°C to 300°C) grants it unparalleled thermal shock resistance. A properly annealed fused quartz window heated to 1000°C can be plunged into room-temperature water without cracking, a stress environment that immediately shatters borosilicate or sapphire.

With our 5-axis ultrasonic CNC milling centers and computerized planetary double-sided polishers, we routinely maintain dimensional diameter/width tolerances of ± 0.02 mm, thickness tolerances of ± 0.01 mm, and parallelism < 5 arcseconds (down to 1 arcsecond on request). Surface flatness (transmitted wavefront distortion) can be verified by Zygo laser interferometry up to λ/10 or λ/20 at 632.8 nm. Surface quality meets military specifications MIL-PRF-13830B standards, offering 10-5, 20-10, or 40-20 scratch-dig ratings. Chamfers are applied to reduce edge chipping during installation.

Yes. For ultra-high vacuum (UHV) viewports, cryostat observation windows, and semiconductor chemical vapor deposition (CVD) chambers, we supply pre-mounted quartz windows brazed or hermetically sealed into standard stainless steel CF (ConFlat), KF (Klein Flange), or ISO flanges. We utilize active alloy vacuum brazing or specialized graded-glass transition sleeves to bridge the thermal expansion gap between stainless steel (CTE ~16 × 10⁻⁶/°C) and fused silica (CTE ~0.55 × 10⁻⁶/°C), yielding helium leak test rates lower than 1 × 10⁻¹⁰ Pa·m³/s.

Bubble classification is performed in accordance with ISO 10110-3 and DIN 58927 standards. For optical grades (JGS1 and Class A JGS2), ingots are synthesized under computer-monitored CVD or vacuum electro-fusion conditions that eliminate air entrapment. Every fabricated window undergoes high-intensity oblique side-illumination inspection against a black background to detect micro-bubbles down to 0.05 mm cross-sectional area. Inclusions, seeds, and particulate contamination are strictly kept within Class 0 or Class 1 thresholds, ensuring that high-energy laser beams encounter no scattering centers that could induce optical damage.

To support R&D institutions, optics laboratories, and early-stage industrial equipment design, our standard MOQ for custom CNC machined prototypes is 1 piece to 5 pieces. Prototyping lead times typically range from 7 to 12 working days following drawing approval. For volume production orders (several thousand pieces), lead times are scheduled in predictable batch deliveries via express air (FedEx/DHL/airfreight) or sea container freight with full export documentation.

Export packing represents a dedicated engineering step within our facility. High-precision polished optical windows are first coated with peelable protective protective lacquers or dust-free lens paper, sealed in multi-layer anti-static cleanroom pouches, and seated in custom-molded high-density polyethylene/EVA foam matrix trays. These individual containers are surrounded by shock-absorbing corner bumpers within multi-wall corrugated master cartons, then placed into fumigation-free engineered plywood crates. Accelerometer drop-tested procedures ensure survival even under rigorous handling.

Yes. While uncoated fused quartz exhibits approximately 3.5% to 4.0% Fresnel reflection loss per surface across the visible spectrum (refractive index n ≈ 1.458 @ 589 nm), we offer custom vacuum ion-assisted deposition (IAD) dielectric thin-film coatings. Standard options include V-coat AR for specific laser lines (such as 266 nm, 355 nm, 532 nm, 1064 nm), broadband anti-reflective (BBAR) coatings covering 400–700 nm or 700–1100 nm (yielding residual reflection R < 0.5% per surface), dual-band AR, and high-reflection (HR) dielectric coatings engineered for high laser damage thresholds.