Fused Silica Window
- Prototype lead time: 4–5 weeks (depending on specifications)
- MOQ: from 50 pieces for standard production
- AR / HR coating available for UV, visible, and IR wavelength ranges
- Diameter range: 2 mm – 200 mm
- OEM / ODM production based on customer drawings supported
Description
Fused silica windows (also known as fused quartz windows) are precision optical components designed for UV, visible, and laser applications requiring high transmission, thermal stability, and excellent surface accuracy.
👉 Learn more about our Optical Windows solutions or explore custom optical components for OEM projects.
Compared with ordinary glass, fused silica provides lower thermal expansion, higher purity, and superior resistance to heat shock, making it ideal for demanding industrial and scientific environments.
👉 Learn more:
BK7 Optical Windows | Sapphire Optical Windows
Elyonoptics supply custom fused silica windows in standard or OEM dimensions with polishing and coating services available.
Specifications
| Diameter Tolerance: | +0.0/-0.1mm |
| Thickness Tolerance: | ±0.1mm/±0.005mm |
| Clear Aperture: | >85%,>95% |
| Parallelism: | 3 min , 3 sec |
| Surface Quality: | 60-40 |
| Flatness: | λ /2 , λ/8 , λ/10 |
| Bevel Protective: | <0.25mm X 45° |
| Coating: | Optional |
Precautions for Fused Silica Windows:
1. Customized fused silica windows ranging from ∅2.0mm to 200mm are available.
2.In addition to circular shapes, square or other polygonal shapes can also be provided
3.with 100% clear aperture achievable upon request.
4.Chamfers of any size and angle can be fabricated according to customer drawings.
5.Anti-reflection coatings, high-reflection coatings, and other coating systems are available.
Applications
- Laser systems
- UV sterilization equipment
- Imaging systems
- Semiconductor instruments
- Analytical devices
- Aerospace optics
Standard Round UVFS Window:
Specifications:
| Specification | Value |
|---|---|
| Material | UVFS |
| Diameter Tolerance | +0.0/-0.2mm |
| Thickness Tolerance | ±0.2mm |
| Clear Aperture | >90% |
| Parallelism | <1 arc minute |
| Surface Quality | 60-40 |
| Flatness | <λ @ 633nm per 25mm |
| Bevel Protective | <0.5mm × 45° |
| Material | Diameter（mm） | Thickness（mm） |
|---|---|---|
| UVFS | 10 | 3 |
| UVFS | 12.7 | 3 |
| UVFS | 15 | 3 |
| UVFS | 20 | 3 |
| UVFS | 25.4 | 3 |
| UVFS | 30 | 3 |
| UVFS | 38.1 | 3 |
| UVFS | 50.8 | 3 |
High Precision Round UVFS Window:
Specifications:
| Specification | Value |
|---|---|
| Material | UVFS |
| Diameter Tolerance | +0.0/-0.2mm |
| Thickness Tolerance | ±0.2mm |
| Clear Aperture | >90% |
| Parallelism | <10 arc seconds |
| Surface Quality | 20-10 |
| Flatness | <λ/10 @ 633nm per 25mm |
| Bevel Protective | <0.5mm × 45° |
| Material | Diameter（mm） | Thickness（mm） |
|---|---|---|
| UVFS | 10 | 6.35 |
| UVFS | 12.7 | 6.35 |
| UVFS | 15 | 6.35 |
| UVFS | 20 | 6.35 |
| UVFS | 25.4 | 6.35 |
| UVFS | 30 | 6.35 |
| UVFS | 38.1 | 6.35 |
| UVFS | 50.8 | 6.35 |
Standard Round Coated UVFS Window:
| Specification | Value |
|---|---|
| Material | UVFS |
| Dimension Tolerance | +0.0/-0.2mm |
| Thickness Tolerance | ±0.2mm |
| Surface Quality | 60/40 |
| Clear Aperture | >90% |
| Wavefront Distortion | <λ/8 @ 633nm per 25mm |
| Parallelism | <30 arc seconds |
| Chamfer | Protected <0.5mm × 45° |
| Coating | Narrow band: R<0.25% per surface, AOI=0deg Broadband: R<0.5% per surface, AOI=0deg |
| Damage Threshold | UVFS: >10J/cm², 20ns, 20Hz, @1064nm |
| Material | Diameter（mm） | Thickness（mm） | Coating Wavelength(nm) |
|---|---|---|---|
| UVFS | 12.7 | 3 | 260-270 |
| UVFS | 25.4 | 6.35 | 260-270 |
| UVFS | 50.8 | 6.35 | 260-270 |
| UVFS | 12.7 | 3 | 351-355 |
| UVFS | 25.4 | 6.35 | 351-355 |
| UVFS | 50.8 | 6.35 | 351-355 |
| UVFS | 12.7 | 3 | 515-532 |
| UVFS | 25.4 | 6.35 | 515-532 |
| UVFS | 50.8 | 6.35 | 515-532 |
| UVFS | 12.7 | 3 | 1028-1064 |
| UVFS | 25.4 | 6.35 | 1028-1064 |
| UVFS | 50.8 | 6.35 | 1028-1064 |
FAQs
1. What is your MOQ for fused silica windows?
Our standard MOQ is 50 pieces for regular production.
For small orders (≤50 pcs), we can still accept production and provide full inspection reports and measurement data for each piece upon request.
2. Do you support small batch or prototype orders?
Yes. We support small batch and prototype production for testing and evaluation before mass production.
3. What is your production lead time?
- Standard polished fused silica windows: 4–5 weeks
- Coated optical windows (AR / HR): 5–6 weeks, depending on coating type and specifications
4. Do you provide inspection reports?
Yes. We provide quality inspection reports based on order quantity:
- ≤50 pcs: Full inspection data for each piece available
- 100–1,000 pcs: 5%–10% random sampling inspection reports
- >1,000 pcs: 0.5% sampling inspection reports
All inspection data includes dimensional and surface quality parameters.
5. What coating options are available?
We offer:
- Anti-Reflection (AR) coatings
- High-Reflection (HR) coatings
- Broadband coatings
- Custom wavelength coatings (UV / Visible / IR)
6. Can you manufacture custom sizes and shapes?
Yes. We support OEM manufacturing according to drawings.
Available shapes include:
- Round
- Square
- Rectangular
- Stepped
- Wedged
- Drilled / special structures
7. What materials do you use for fused silica windows?
We use high-purity optical-grade fused silica materials suitable for UV, visible, and laser applications, including equivalent materials from global optical standards.
8. What quality certifications do you have?
We are certified under international quality management systems, including:
- ISO 9001 Quality Management System
- IATF 16949 Automotive Quality System
- Good Standardization Practices Certification
We also apply strict internal quality control processes, including dimensional inspection, surface quality testing, and coating performance verification before shipment.
Optical Coating Capability
❶ Can you provide custom optical coatings?
Yes. We provide fully custom optical coating design based on customer requirements, including wavelength range, incident angle (AOI), and target optical performance.
❷ Can you match customer coating curves?
Yes. We can design and manufacture coatings based on customer-provided transmission or reflection curves. The following coating curves are examples of previous custom projects.
❸ What coating types do you offer?
We offer AR (Anti-Reflection), HR (High-Reflection), broadband coatings, and laser-specific coatings for UV, visible, and infrared wavelengths.
❹ Is custom coating available for laser applications?
Yes. We support laser-grade coatings for high-power applications such as 355nm, 532nm, and 1064nm laser systems with high damage threshold requirements.
