Industrial Plano-Concave Lens BK7 2 Inch D50.8mm Negative Focal Length -75 to -500mm Beam Expansion Optics AR1064 Available

You can see that we only sell optical components because we specialize in optical components, so we are very professional.

We also have lots of other different custom-made size and focal length lenses that are not showed in the following product sheet.Customers who need special dimension lenses can also contact us .

Plano Concave Lenses have a negative focal length and they cause parallel rays to diverge when exiting the lens. They are used to expand light beams or to increase focal lengths in optical systems or other applications.

Material:K9/BK7

Diameter Tolerance:+0.0/-0.2mm

Thickness Tolerance:±0.15mm

Surface Accuracy:λ/2

Surface Quality:60-40

Centration:3-5 arc min

Clear Aperture:>90%

Bevel: 0.3mm×45°

Other lens sheet

Specification

Model: D50.8 F-150-AR1064

Plano-concave lens, Diameter: 50.8 mm, Focal length: -150 mm.
Substrate: BK7 optical glass, Surface quality: 60-40 scratch/dig.
With AR anti-reflection coating optimized for 1064 nm; Coating laser damage threshold: 500 mJ/cm² @1064nm.

Model: D50.8 F-125-AR1064

Plano-concave lens, Diameter: 50.8 mm, Focal length: -125 mm.
Substrate: BK7 optical glass, Surface quality: 60-40 scratch/dig.
With AR anti-reflection coating optimized for 1064 nm; Coating laser damage threshold: 500 mJ/cm² @1064nm.

Core Advantages of K9/BK7 Plano-Concave Lens

Excellent Optical Performance
High transmittance and low absorption in the visible light spectrum, ensuring clear imaging and minimal energy loss.

High Cost-Effectiveness
Made from K9/BK7 optical glass, offering reliable performance at an economical price with great durability.

Precision Negative Focal Length
Designed to effectively diverge laser beams, reduce spot size, and correct optical aberrations.

Customizable Specifications
Available in various diameters and focal lengths; AR coating options reduce reflection for higher efficiency.

Typical Applications

Laser Beam Expanding
Key component in laser expanders for marking, cutting, and engraving systems.

Aberration Correction
Used in imaging systems like microscopes and telescopes to improve clarity and reduce distortion.

Educational & Experimental setups
Ideal for physics labs and optical experimentation involving beam shaping and path control.

VR & Sensor Systems
Integrated into VR devices and optical sensors for precise light guidance.

Industrial Imaging & Measurement
Supports machine vision and metrology systems requiring high precision.

This lens can be paired with our store's lens frame/coaxial lens frame.

After sales Policy Statement

Quality assurance commitment
All optical components in our store undergo strict quality inspection before leaving the factory. If you receive products with obvious scratches, coating peeling, or performance parameters that do not meet standards, please contact customer service within 24 hours after signing and provide proof. We will provide you with a satisfactory solution
Special usage tips
Due to the extremely fragile surface of optical components, returns and exchanges are not accepted in the following situations: Coating damage caused by human contact/wiping of unsealed products, fingerprint contamination caused by non use of anti-static gloves, and performance degradation caused by non-standard storage environment (temperature>40 ℃ or humidity>60%). Recommended operation: Wear dust-proof gloves when opening, use professional lens cleaning tools, and store in a moisture-proof box.