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

●‌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 than20 years experience in optical cold working.
 
Q2:What is the MOQ of your products?
No MOQ for customer if our productis 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 canI 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.
 
Q7:How do you controlthe quality?
More than four times quality inspect during production process, we can provide the Quality test report.
 
Q8:How about your optical lens production ability per Month?
About 20000pcs/Month.According to the detail requirement.
 
Q9:What is your payment term? 
T/T or L/C,if you want any other way,please contact us.

●freight

●payment