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BK7 Optical Glass Lens
Product Specification
Place of Origin:
China
Brand Name:
Advance
Certification:
ROHS\Reach
Model Number:
as requirements
Minimum Order Quantity:
1
Price:
$0.2~$100
Payment Terms:
T/T&L/C
Supply Ability:
1000k/per month
Product Details
Highlight:
0.001mm 60/40 BK7 Optical Glass Lens
,bk7 60/40 0.001mm Optical Glass Lens
,0.001mm BK7 60/40 Meniscus Lens
Customized Support:
OEM, ODM
Usage:
Optical
Shape:
Spherical
Material:
Optical Glass
Focal Length:
Custom
Coating:
Upon Request
Diameter:
25 Mm
Diameter Tolerance:
+/-0.005mm
Surface Accuracy:
N=1~0.5
Centerthickness Tolerance:
+/-0.001mm
Focal Length Tolerance:
+/-1%
Surface Quality:
10/5~60/40
Centerthickness:
5 Mm
Width Tolerance:
+/-0.01mm
Style:
Antique
Operatingtemperature:
-20 To 70 °C
Refractiveindex:
1.52
Focal Length:
150mm
Product Description
BK7 Optical Glass Lens
Expertise: Versatile Material Engineering
Our optical lenses are engineered for performance across the entire electromagnetic spectrum. We provide expert material selection tailored to your specific waveband requirements, ensuring optimal transmission and thermal stability.
- Visible & NIR: High-grade BK7 (K9) and Optical Glass for cost-effective, high-clarity imaging.
- UV & High Power: Premium Quartz (Fused Silica) and CaF₂ for superior UV transparency and laser damage resistance.
- Infrared (IR): Precision-ground Germanium (Ge), Silicon (Si), and Zinc Selenide (ZnSe) for thermal imaging and CO₂ laser applications.
- Extreme Durability: Sapphire substrates for harsh environments requiring scratch resistance and high thermal conductivity.
Technical Specifications
| Parameter | Specifications |
|---|---|
| Materials | BK7 or other optical glass, quartz, sapphire, Ge, Si, ZnSe, CaF₂ etc |
| Diameter | 1.5~300mm |
| Radius | R0.8mm-∞ |
| Focal length | -30000mm~+30000mm |
| Center thickness tolerance | ±0.01mm |
| Diameter tolerance | ±0.005mm |
| Focal length tolerance | ±1% |
| Surface accuracy | N=1~3 |
| Irregularity | ΔN=0.1~0.5 |
| Decenter | 3"~1" |
| Surface quality | 10/5~60/40 |
| Coating | Upon request |
| Application area | Imaging, Lighting, Laser etc |
Experience: Multi-Industry Application Solutions
Our lenses aren't just components; they are solutions for global industries. We understand the nuanced requirements of:
- Imaging Systems: High-resolution lenses with ΔN = 0.1 irregularity for medical endoscopy and machine vision.
- Laser Technology: Specialized coatings and substrates (ZnSe/Quartz) capable of withstanding high peak power densities.
- Precision Lighting: Custom radii (R0.8mm to ∞) designed to optimize light extraction and beam shaping.
Trustworthiness: Quality Assurance & Coating
Custom Coating Services (Upon Request): Every lens can be optimized with tailored thin-film coatings, including BBAR (Broadband Anti-Reflection), V-Coats for specific laser lines, and Diamond-Like Carbon (DLC) for ruggedized IR windows.
Rigorous Metrology:
- Interferometric Testing: We verify surface irregularity (ΔN) using state-of-the-art Zygo interferometers.
- Full Traceability: Each batch is accompanied by a comprehensive inspection report detailing dimensional accuracy and spectral performance.
- Global Compliance: All materials are RoHS and REACH compliant, meeting international environmental and safety standards.
Frequently Asked Questions
Q1: How do you achieve a diameter tolerance of ±0.005mm for small lenses?
Achieving micron-level precision requires a combination of high-stability CNC grinding machines and strictly controlled ambient temperatures in our facility. For lenses between 1.5mm and 10mm, we utilize specialized micro-optics centering equipment to ensure both dimensional accuracy and minimal decenter (down to 1").
Q2: What is the significance of "Irregularity ΔN = 0.1~0.5"?
While Surface Accuracy (N) refers to the overall power deviation, Irregularity (ΔN) measures the local variation or "smoothness" of the lens surface. A ΔN of 0.1 indicates a nearly perfect spherical surface, which is essential for diffraction-limited imaging and high-power laser systems to prevent beam distortion and hot spots.
Q3: For IR materials like Germanium (Ge) and ZnSe, how do you manage surface quality?
IR crystals are generally softer and more brittle than BK7 glass. We employ specialized diamond turning (SPDT) and custom polishing slurries to achieve a 20-10 Scratch-Dig surface quality. This prevents subsurface damage and ensures high transmission efficiency in the 8μm to 12μm range.
Q4: Can you manufacture lenses with an extremely short radius (R0.8mm)?
Yes. Our production line is optimized for high-curvature optics. Manufacturing a 0.8mm radius requires custom-made diamond tools and precise interferometric monitoring to ensure the focal length remains within the specified ±1% tolerance.
Q5: When should I specify CaF₂ (Calcium Fluoride) instead of Quartz?
While Quartz is excellent for UV, CaF₂ is preferred when your application spans from the Vacuum UV (180nm) to the mid-infrared (7μm). Additionally, CaF₂ has a low refractive index and low chromatic aberration, making it ideal for high-end apochromatic lens designs.
Q6: How do you ensure the durability of coatings on Sapphire substrates?
Sapphire is exceptionally hard (9 on the Mohs scale). To ensure coating adhesion, we use Ion-Assisted Deposition (IAD) technology. This process increases the packing density of the thin films, making the coating as rugged as the substrate itself, capable of passing severe abrasion and humidity tests.
Q7: Do you provide certification for the focal length and surface accuracy?
Yes. Every high-precision order can be provided with a Metrology Report. We use Zygo NewView interferometers for surface topography and automated focal length meters to verify that every parameter—from N values to center thickness—meets your exact blueprint.
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