20 mm N-BK7 Biconcave Lens, AR Coated

Product description

The biconcave lens made from N-BK7 is ideal for applications in medical imaging, projection systems, and optical collimation. Its design features two inward-curving surfaces that diverge light, making it suitable for increasing beam diameter and correcting optical aberrations across a wavelength range of 0.4 to 1.7 μm. With a surface quality of 20/10 and an anti-reflective coating option, this lens ensures high transmittance and minimal surface reflection, enhancing performance in various optical systems.

Key Features

Biconcave design for effective light divergence, enhancing imaging and projection capabilities.
Surface quality of 20/10 ensures minimal distortion and high clarity in optical applications.
Customizable diameters from 5mm to 200mm for tailored solutions to fit specific project needs.
AR coating options available to improve transmittance and reduce reflection.
Durable N-BK7 material provides excellent thermal and chemical resistance for long-term reliability.

Applications

Medical, Projection, Collimation, Imaging

Specification Summary

Item	Value
Material	N-BK7
Shape	Biconcave
Diameter	20 mm
Surface Quality	20/10
Coating	anti-reflective (AR)
Transmission bands	NIR (0.7-1.7 μm), VIS (400-700 nm)

Full Specifications

Parameter	Value
Type	concave lens
Customized Support	OEM, ODM, OBM
Warranty	3 Years
Weight	0.05
Flatness	lambda/4
Clear Aperture	Central 90%

FAQ

Can I get custom sizes for this lens?

Yes, diameters can be customized from 5mm to 200mm to meet specific requirements.

What are the tolerances for diameter?

The diameter tolerance is ±0.0-0.1mm, ensuring precise fitting in optical systems.