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0102030405

High-Index BK7 Biconvex Lens for UV-Vis-NIR Optics - China Suppliers & Factory Quality

Discover high-quality biconvex lenses from ALHAZEN, made from high-index BK7 glass. These lenses feature dual convex surfaces with a focal length tolerance of ±1%, ensuring precision for your optical needs. With a clear aperture of ≥95% and surface flatness of less than λ/5 (@633nm), our lenses are designed for outstanding performance. They are compatible with 250–2000nm UV-Vis-NIR ranges, making them ideal for applications in laser focusing, imaging relays, and advanced optical instruments. As a trusted China supplier, our factory prioritizes excellence in manufacturing, delivering reliable components for your optical solutions.

Product Detail

High-Index BK7 Biconvex Lens for UV-Vis-NIR Optics

1. Core Functions

Precision Focusing: Optimized conjugate ratio (0.2–5) minimizes spherical/chromatic aberrations;
Broadband Transmission: BK7 covers 250–2000nm with >90% transmission (VIS: 400–700nm).
Low Reflection Loss: Single/dual-sided AR or BBAR coatings with <0.5% reflectivity per surface.

2. Technical Specifications

Materials & Design:
- N-BK7 Glass: Refractive index 1.5168 @587.6nm, Abbe number 64.17, Grade A purity;
- High-Index Options: LaK9, SF11 (n >1.7) for thinner lens designs.
Precision:
- Surface flatness <λ/5 (@633nm), local figure error <λ/10;
- Diameter tolerance +0.00/-0.02mm, CT tolerance ±0.05mm, eccentricity ≤1 arcmin;
- Surface quality 40-20 scratch/dig (upgradable to 20-10).
Coatings:
- Single-Wavelength AR: Customized for 355nm, 532nm, 1064nm (<0.25% reflectivity);
- Broadband BBAR: Covers 300–1500nm with <0.75% average reflectivity.

3. Applications

Laser Systems: Collimation/focusing in fiber lasers for precision machining;
Imaging Relays: Objective lenses in microscopes/telescopes for 1:1 conjugate imaging;
Spectroscopy: Focusing optics in FTIR systems to enhance SNR.

4. Customization

Flexible Parameters: 5–260mm diameter, 1–5000mm focal length with ±0.5% radius tolerance;
Pre-Assembled Kits: Integrated with mounts/alignment frames for plug-and-play use;
Fast Turnaround: Standard orders in 7 days, special requests <3 weeks.

Differentiation Highlights

Nanometer-Level Precision: Profilometer QC guarantees ±0.02mm diameter tolerance for micro-optics;

High-Index Versatility: Materials like SF11 enable short focal lengths for compact optical designs.

Custom & OEM Process

Materials capabilities

Coating capabilities

Advanced Equipment

Custom Sizes and Shapes

Quality Assurancetesting

Experienced Team

Company introduction

Q&A

Q1 Are you a factory?

Yes, we are a professional manufacturer of optical components, we have more than 20 years experience in optical cold working.

Q2 What is the MOQ of your products?

No MOQ for customer if our product is in stock, or 1-10pcs.

Q3 Can I custom the products based on my requirement?

Yes, we can custom the material, specifications and optical coating for your optical components as your requirement.

Q4 How can I get sample from you?

Just send us your requirements, then we will send samples accordingly.

Q5 How many days will samples be finished? How about mass products?

Generally, we need 1-2 days to finish the sample production. As for the mass products, it depends on your order quantity.

Q6 What's the delivery time?

(1) For inventory: the delivery time is 1-3 working days.
(2) For customized products: the delivery time is 7 to 25 working days According to the quantity.