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

ALHAZEN's high-index BK7 biconvex lenses are expertly crafted in our China factory and designed with dual convex surfaces to ensure superior optical performance. These lenses maintain a focal length tolerance of <±1%, feature a clear aperture of ≥95%, and boast a surface flatness of <λ/5 at 633nm. Specifically tailored for compatibility across the 250–2000nm UV-Vis-NIR range, they are ideal for applications such as laser focusing, imaging relays, and precision optical instruments. Choose ALHAZEN, a trusted supplier for high-quality optical components.

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.