Featured Machined Quartz & Cavity Components
Precision-machined substrates, laser pump reflectors, and custom-fabricated quartz glassware derived from calibrated rough cut blanks. Fully customizable to engineering prints.
Engineering Metallurgy of Rough Cut Quartz Blanks
A complete analysis of fused silica boules, diamond wire slicing mechanics, and purity classification across synthetic and natural crystalline substrates.
What Defines an Industrial "Rough Cut Quartz Blank"?
In high-precision optical fabrication and semiconductor component manufacturing, a rough cut quartz blank (also termed an unpolished quartz substrate or as-cut fused silica preform) represents the fundamental precursor material. It is sliced directly from synthesized fused silica boules, electrically fused ingots, or gas-refined natural crystal ingots using multi-wire slurry or diamond-impregnated inner-diameter (ID) saws.
Unlike standard float glass or polished optical windows, a rough cut blank exhibits a controlled surface roughness ($Ra \approx 0.8\text{ to }2.5\,\mu\text{m}$) and carries a nominal dimensional allowance ($+0.2\text{ to }+0.5\text{ mm}$) engineered specifically to absorb subsequent CNC edging, double-sided planetary lapping, and chemo-mechanical polishing (CMP).
Our Tianjin machining line operates under dynamic tension control with specialized deionized cooling oils during slicing. This reduces the Subsurface Damage (SSD) depth to under $18\,\mu\text{m}$, cutting down grinding cycle times by up to 40% for downstream optical polishers.
| Standard Grade | Synthesis Process | Transmission (nm) | Hydroxyl [OH⁻] Content |
|---|---|---|---|
| JGS1 (UV Synthetic) | $\text{SiCl}_4$ Chemical Vapor Deposition | $185 - 2,500\text{ nm}$ | $< 1,200\text{ ppm}$ (Ultra-low bubble) |
| JGS2 (Optical Quartz) | Oxyhydrogen Fused Crystal Quartz | $220 - 2,500\text{ nm}$ | $< 150\text{ ppm}$ |
| JGS3 (IR Fused Quartz) | Electric Vacuum Melting | $260 - 3,500\text{ nm}$ | $< 5\text{ ppm}$ (OH-Free absorption) |
| High-Purity Natural | Arc Melting of Purified Granules | $200 - 2,200\text{ nm}$ | $< 30\text{ ppm}$ (Ideal for CVD tools) |
Why Global OEMs Source Rough Cut Quartz Blanks from China
Direct upstream quartz crystal sourcing in Donghai paired with Tianjin's advanced cold/hot working facilities delivers unbeatable production speed and material integrity.
Purity Corridor Integration
China houses the world's most concentrated silicon refining ecosystem. By keeping ingot fusion, seed crystallization, and secondary sawing inside a localized manufacturing loop, raw silica costs are kept 30–45% below European and Japanese benchmarks without compromising chemical purity ($> 99.999\%$).
- ✔ ICP-MS certified trace metal levels ($< 0.1\text{ ppm Fe, Cu, Ti}$)
- ✔ Direct connection to crystalline silica deposits
- ✔ Complete lot-by-lot raw boules traceability
Multi-Wire Ingot Slicing
Tianjin BY Photonics operates high-speed multi-wire diamond sawing arrays capable of simultaneously slicing up to 200 quartz blanks per cycle. This technology slashes kerf loss by over 25% compared to antiquated circular diamond blades, preserving valuable high-purity optical fused quartz.
- ✔ Diameters up to $\varnothing 450\text{ mm}$ for wafer stages
- ✔ Kerf thickness controlled down to $0.25\text{ mm}$
- ✔ Minimal stress-induced bow and warp ($< 15\,\mu\text{m}$)
Cold & Hot Working Under One Roof
Unlike common trading brokers, our Tianjin facility combines oxyhydrogen thermal flame reforming with multi-axis CNC milling. Blanks can be delivered as rough-cut discs or fully contoured preforms with edge bevels, core-drilled holes, and customized stepped geometries in one continuous workflow.
- ✔ In-house precision hydrogen-oxygen fusing
- ✔ Standardized stress-relief annealing furnaces
- ✔ Rapid turnaround: prototypes in 3–5 working days
Macro Industry Trends & Next-Generation Engineering Demands
As semiconductor nodes push past sub-3nm architectures and industrial lasers exceed 50 kW optical pump thresholds, the technical demands placed on rough cut quartz blanks are changing fast.
EUV Photolithography Substrates
Extreme Ultraviolet (13.5 nm) optical trains require ultra-low expansion (ULE) fused silica blanks with virtually zero thermal drift ($< \pm 5\,\text{ppb/K}$ between $20^\circ\text{C}$ and $35^\circ\text{C}$). Slicing blanks with minimal internal stress is critical to preventing wavefront distortion.
Multi-kW Laser Optics Blanks
High-power industrial fiber laser cutting heads demand optical preforms featuring minimal bulk absorption ($< 3\,\text{ppm/cm}$ at $1064\text{ nm}$). Rough cut quartz blanks must exhibit exceptional striae quality (ISO 10110 Class 1) to eliminate thermal lensing phenomena.
Microfluidic Diagnostics & Chips
Modern lab-on-a-chip genetic sequencing devices require ultra-thin fused silica blanks down to $200\,\mu\text{m}$ thickness with high mechanical stability, providing optical clarity into the deep ultraviolet region for fluorescent microscopy.
Solar & Third-Gen Semiconductor
The rapid scaling of Silicon Carbide (SiC) and Gallium Nitride (GaN) epitaxy requires thermal quartz components capable of withstanding operating cycles over $1,250^\circ\text{C}$ in corrosive plasma and halogen atmospheres.
Industrial Application Environments for Rough Cut Quartz Blanks
Engineered preforms designed to match specific operating temperatures, optical wavelengths, and corrosive working conditions.
Semiconductor Wafer Processing
Rough cut blanks serve as raw stock for high-temperature diffusion furnace ware, LPCVD process tubes, quartz wafer carriers, lift pins, and plasma etch rings ($100\text{ mm to }300\text{ mm}$ systems).
- Thermal Resistance: Continuous service at $1,150^\circ\text{C}$
- Purity Level: $\text{Heavy metals } < 5\text{ ppm}$ total
- Etch Resistance: Stable against chlorine/fluorine plasma
Laser Pump Cavities & Optics
Optical preforms for solid-state laser rods, samarium-doped flow tubes, Nd:YAG flashlamp cooling sleeves, and broadband laser output couplers.
- Damage Threshold: $\text{LIDT } > 15\,\text{J/cm}^2 \text{ @ } 1064\text{ nm}$
- Transmission: $> 92\%$ uncoated visible range
- Parasitic Suppression: Doped glass compatibility
Spectroscopy & Analytical Chambers
Substrates for multi-element spectrophotometer cuvettes, UV-VIS-NIR chromatography flow cells, and vacuum chamber viewing ports.
- UV Cutoff: Down to $185\text{ nm}$ in JGS1 synthetic blanks
- Chemical Inertness: Resistant to acidic solutions
- Optical Homogeneity: Delta $n \le 2 \times 10^{-6}$
Global Procurement Matrix: Rough Cut vs. Finished Blank Specifications
Direct comparative technical engineering parameters for optical purchasing directors and mechanical design engineers.
| Dimensional & Optical Parameter | Standard Rough Cut Blank | Precision As-Cut Blank | Pre-Lapped / Fine-Ground Blank |
|---|---|---|---|
| Diameter / Dimension Range | $10.0\text{ to }650.0\text{ mm}$ | $5.0\text{ to }450.0\text{ mm}$ | $3.0\text{ to }350.0\text{ mm}$ |
| Dimensional Tolerance | $\pm 0.20\text{ mm}$ | $\pm 0.05\text{ mm}$ | $\pm 0.015\text{ mm}$ |
| Thickness Tolerance | $\pm 0.15\text{ mm}$ | $\pm 0.05\text{ mm}$ | $\pm 0.010\text{ mm}$ |
| Surface Roughness ($Ra$) | $1.5 - 2.5\,\mu\text{m}$ (Wire-cut matte) | $0.8 - 1.2\,\mu\text{m}$ (Diamond sliced) | $< 0.2\,\mu\text{m}$ (Lapped P1200 grit) |
| Subsurface Damage (SSD) | $< 35\,\mu\text{m}$ | $< 18\,\mu\text{m}$ | $< 5\,\mu\text{m}$ |
| Parallelism / Wedge | $\le 3\text{ arcmin}$ | $\le 1\text{ arcmin}$ | $\le 15\text{ arcsec}$ |
| Bubble / Inclusion Class | DIN ISO 10110 Class 2–3 | DIN ISO 10110 Class 1 | Class 0 (Zero bubbles in aperture) |
Every shipment of rough cut quartz blanks leaves our factory with complete quality documentation: lot-specific spectroscopic transmission curves, raw quartz chemical purity certificates (via GDMS/ICP-MS), coordinate measuring machine (CMM) dimensional reports, and Zygo laser interferometer phase-shift analyses where required.
Technical & Procurement FAQ for Optical Quartz Blanks
Clear, direct answers to common engineering questions asked during design for manufacturing (DFM) reviews.
We typically leave $+0.20\text{ mm to }+0.40\text{ mm}$ on thickness and $+0.25\text{ mm to }+0.50\text{ mm}$ on outer diameter/profile. This ensures enough stock for fine grinding and polishing while keeping material waste and cycle times low. Custom allowances can be applied to match your processing line.
We use high-tension multi-wire diamond slicing systems with variable-pitch wires running in water-soluble, deionized polymer glycols. Cutting parameters are optimized for each material, controlling abrasive grit size and feeds to keep SSD depth below $18\,\mu\text{m}$, reducing cracking risk during fine polishing.
Choose JGS1 for deep UV optics, laser windows, and applications down to $185\text{ nm}$. Select JGS2 for visible light, sight glasses, solar preforms, and general semiconductor quartzware. Opt for JGS3 for thermal imaging, infrared sensing, and moisture-sensitive systems ($2,200 - 3,500\text{ nm}$) where hydroxyl (OH) absorption peaks must be eliminated.
Standard stock sizes ($\varnothing 25.4\text{ mm, }\varnothing 50.8\text{ mm, }\varnothing 100\text{ mm, }\varnothing 200\text{ mm}$) ship within 48 to 72 hours. Custom sliced shapes, core-drilled rings, or high-purity synthetic blanks usually take 5 to 10 working days, backed by our in-house boules inventory in Tianjin.
Yes. Every rough-cut blank processed through our high-temperature ovens follows a controlled ramp and soaking profile ($1,180^\circ\text{C}$ soak down through transformation range at $< 15^\circ\text{C/hr}$). Polarimeter verification reports confirming birefringence below $5\text{ nm/cm}$ are available on request.
Yes. While as-cut blanks normally ship with saw-cut edges, we can apply $45^\circ$ protective chamfers ($0.2\text{ to }1.0\text{ mm}$) or ground C-edges using CNC diamond wheels to prevent micro-chipping during international transport and automated handling.
Precision Quartz Wafers, Tubes & Cavity Assemblies
Explore our full line of finished and semi-finished components, engineered from synthetic fused silica and specialty borosilicate glass.
Submit Your CAD or PDF Prints for Fast Manufacturability Analysis
Work directly with our production engineers in Tianjin, China. Skip distributor markups and get feedback on material grades (JGS1, JGS2, JGS3), tolerance targets, and ingot slicing options within 24 working hours.
Supported Engineering Formats: STEP, IGES, DWG, DXF, or fully dimensioned mechanical PDF drawings. Please specify your target spectral range, thermal limits, and initial order quantities.
Direct Engineering Desk
Contact Tianjin BY Photonics technical sales engineers directly:
Email: [email protected]