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High-Index BK7 Biconvex Lens for UV-Vis-NIR Optics from China Suppliers and Factory - ±1% Focal Length Tolerance

Discover ALHAZEN's high-quality BK7 biconvex lenses, expertly crafted in our China factory. These lenses boast dual convex surfaces with a focal length tolerance of <±1%, ensuring precision in optical applications. With ≥95% clear aperture and <λ/5 surface flatness (@633nm), our lenses are designed for exceptional performance. Ideal for laser focusing, imaging relays, and various optical instruments, they are compatible with UV-Vis-NIR ranges from 250 to 2000nm. Trust ALHAZEN as your leading suppliers for high-index 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 & Shapes

Quality Assurance

Experienced Team

Company Introduction

Frequently Asked Questions

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 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.

Q3 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.

Q4 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.

Q5 How do you control the quality?

More than four times quality inspect during production process, we can provide the Quality test report.

Q6 What is your payment term?

T/T or L/C, if you want any other way, please contact us.