产品: Custom BK7 Optical Glass
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Custom BK7 Optical Glass
Key Technical Parameters of BK7 Optical Glass
| Property | Value |
|---|---|
| Refractive Index (nd) | 1.5168 @ 587.6 nm |
| Abbe Number (Vd) | 64.17 |
| Transmission Range | 330 – 2100 nm |
| Density | 2.51 g/cm³ |
| Coefficient of Thermal Expansion | 7.1 × 10⁻⁶ /°C (20 – 300°C) |
| Knoop Hardness (HK 100) | 610 |
| Young’s Modulus | 82 GPa |
| Poisson’s Ratio | 0.206 |
| Softening Point | ~722°C |
| Annealing Point | ~560°C |
| Internal Transmission (@10 mm) | >90% (400–700 nm) |
Overview: What is BK7 Optical Glass?
BK7 is a high-quality optical glass made primarily of borosilicate crown material. Known for its excellent optical clarity, low inclusions, and good mechanical strength, BK7 is one of the most widely used materials in precision optics and photonics. It is produced using advanced melting and refining techniques to ensure high homogeneity and excellent transmission from visible to near-infrared wavelengths.
BK7 is a cost-effective alternative to fused silica for applications that do not require high UV transmission or extreme thermal resistance.
Why Choose BK7 for Optical and Industrial Applications?
- Excellent Optical Transmission: High transmittance in the visible spectrum (~90% at 400–700 nm).
- Refractive Index Stability: Refractive index of ~1.5168 at 587.6 nm (d-line).
- Good Thermal and Mechanical Properties: Density of 2.51 g/cm3, low bubble/inclusion count, and moderate hardness.
- AR Coating Compatibility: Ideal substrate for anti-reflective coatings due to surface smoothness.
- Homogeneity: Excellent uniformity for precision lenses, windows, and prisms.
Advantages of BK7 Optical Windows
BK7 optical windows offer several advantages over other materials such as:
- High Transmission: BK7 glass delivers excellent transmission in the visible and near-infrared regions, making it suitable for imaging, photonics, and laser applications.
- Low Dispersion: Its low dispersion helps minimize chromatic aberrations, ensuring high image fidelity and color accuracy.
- Cost-effective: Compared to other optical materials like fused silica or sapphire, BK7 is more economical while still offering strong optical performance.
- Durability: BK7 exhibits good resistance to thermal and mechanical shock, making it ideal for both lab and field environments.
Your Trusted BK7 Glass Supplier and Custom Processor
We are a direct BK7 glass supplier offering full-spectrum customization services for industrial and scientific applications. Whether you need coated windows, plano-convex lenses, or precision prisms, we deliver:
- OEM and custom-size blanks or finished components
- Lens-edge polishing, beveling, and chamfering
- CNC precision machining for complex geometries
- Full export documentation and fast global delivery
BK7 Glass Processing Capabilities
We offer advanced machining and finishing services tailored for BK7 glass:
- Precision Cutting: CNC-controlled cutting for round, square, and irregular shapes.
- Optical Polishing: Surface roughness Ra ≤ 0.01 µm for high-performance optics.
- Coating Services: AR, HR, dielectric, beamsplitter, and custom filters.
- Beveling & Chamfering: For safety and mechanical integration.
- Lens Fabrication: Spherical, plano-convex, plano-concave, and custom lens production.
- Hole Drilling & Grooving: For mechanical mounting and alignment purposes.
Industries and Applications Served
Optical and Imaging Systems
- Lenses, prisms, beamsplitters
- Optical windows and viewports
Laser Technology
- Protective laser windows
- Optical isolator components
Scientific Research & Metrology
- Precision optical assemblies
- Interferometers and spectrometers
Industrial Equipment
- Machine vision systems
- Sensor protection covers
Aerospace and Defense
- Ruggedized optics for harsh environments
- Infrared-compatible components with coatings
Partnering with Universities and Research Institutions Worldwide
We collaborate with universities and research labs across the globe, supplying custom BK7 optical elements for experiments, teaching equipment, and prototyping needs. Our support includes:
- Tight tolerance components
- Lab-ready packaging
- AR-coated educational optics
- Engineering consultation for experimental optics
People Also Ask
1. What is BK7 glass used for?
BK7 is widely used in lenses, windows, prisms, and other precision optics for imaging, laser, and scientific systems.
2. Can BK7 glass be customized?
Yes, BK7 can be cut, ground, polished, coated, drilled, and shaped into custom optical elements.
3. Is BK7 suitable for AR coatings?
Absolutely. BK7 has excellent surface quality and low roughness, making it ideal for anti-reflective coatings.
4. What’s the difference between BK7 and fused silica?
BK7 is more economical and has better visible transmission, while fused silica offers better UV transparency and thermal shock resistance.
5. Can BK7 glass be used for laser applications?
Yes, especially for visible and near-IR laser systems where thermal stability is moderate.
6. Do you offer small quantity custom BK7 optics?
Yes, we support both R&D samples and mass production with flexible MOQ.
Available Thicknesses for Custom BK7 Glass Components
| Nominal Thickness (mm) | Thickness Tolerance (± mm) | Typical Application | Maximum Size (mm) |
|---|---|---|---|
| 0.50 | ±0.01 | Protective covers, thin windows | 100 × 100 |
| 1.00 | ±0.02 | Laser optics, beam shaping windows | 150 × 150 |
| 2.00 | ±0.03 | AR-coated lenses, low-stress windows | 200 × 200 |
| 3.00 | ±0.05 | Imaging optics, prisms, filters | 300 × 300 |
| 5.00 | ±0.05 | Large optics, instrument glass | 300 × 400 |
| 10.00 | ±0.10 | Structural optical parts | 400 × 500 |
Custom thicknesses and larger sizes are available upon request.
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