Factory Custom Optical BK7 Glass Meniscus Lens

Name: Factory Custom Optical BK7 Glass Meniscus Lens
Brand: Henan UM Optics Ltd
Availability: InStock

Description

BK7 meniscus lens are precision optical components featuring one convex and one concave spherical surface, engineered from high-purity BK7 optical glass. Classified as either positive (convex radius smaller than concave radius, converging light) or negative (concave radius smaller than convex radius, diverging light), these lenses are optimized for the visible to near-infrared (NIR) spectrum (400–2000 nm). Designed to minimize spherical aberration, coma, and chromatic aberration when integrated into multi-element optical systems, BK7 meniscus lens balance high optical performance with cost-effectiveness. Manufactured via advanced grinding and polishing processes, they meet strict tolerances and can be customized in size , focal length, and coatings to suit diverse system requirements—making them a staple in industrial, scientific, and consumer optics.

Specifications

Material:	BK7
Diameter:	25.4 mm
ROC1:	100 mm
ROC2:	-33.7 mm
Diameter Tolerance:	+0/-0.1mm
Thickness Tolerance:	±0.1mm
Surface Quality:	60-40 Scratch-dig
Flatness:	1/4 lambda
Parallelism:	<3 arcmin

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Features

Broad Spectral Performance: >90% transmittance across 400–2000 nm (visible/NIR), with minimal absorption for white-light and low-power laser applications
Low Aberration Profile: BK7 glass’s low dispersion (Abbe number νd = 64.1) and the lens’s asymmetric curvature reduce spherical aberration and coma, critical for high-resolution imaging
Superior Optical Homogeneity: Uniform refractive index (n_d = 1.5168) and minimal internal stress ensure consistent light transmission, ideal for precision systems like microscopy and telescopes
Mechanical Durability: Mohs hardness of 5.5 and thermal expansion coefficient of 7.1 × 10⁻⁶/°C, offering resistance to scratches and stable performance in temperatures ranging from -20°C to 120°C
Customizable Design: Available as positive/negative configurations; customizable diameters, edge thicknesses, and focal lengths. Compatible with broadband AR coatings (400–700 nm for visible, 700–1100 nm for NIR) to reduce reflection losses to <0.5% per surface
Cost-Effective Precision: BK7 is a widely available, industry-standard glass, delivering premium optical performance at a competitive price point for both low-volume prototypes and high-volume production

Applications

Imaging Systems: Integrated into DSLR cameras, surveillance lenses, and microscope objectives to correct aberrations and enhance image sharpness
Laser Technology: Used in low-power laser collimation (He-Ne, diode lasers) and beam shaping—positive lenses converge collimated light, while negative lenses diverge beams for uniform illumination
Astronomical & Consumer Optics: Found in telescope eyepieces, binoculars, and spotting scopes to improve light gathering and reduce distortion
Medical Devices: Utilized in ophthalmic instruments (slit lamps, retinal cameras) and diagnostic equipment to focus light onto target tissues with minimal optical distortion
Optical Instrumentation: Employed in spectrometers, interferometers, and laser rangefinders to optimize light path control and system accuracy

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Ships from:

China

Sold by:

Henan UM Optics Ltd

On FindLight:

since 2024

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Frequently Asked Questions

What is the difference between a positive meniscus lens and a negative meniscus lens?

The Positive meniscus lenses are thicker in the middle than at the edges, allowing light to converge, and are designed to reduce tertiary spherical aberration. When they are used to converge a collimated beam, the convex side should face the light source to reduce spherical aberration.The negative meniscus lenses are thinner in the middle than at the edges and are designed to reduce tertiary spherical aberration. When used to diffuse the beam, the convex side should face the beam to reduce spherical aberration.

What materials of meniscus lenses can UM OPTICS provide?

CaF2、BaF2、MgF2、LiF、BK7、K9、 Fused silica、Silicon、Ge、ZnS、ZnSe

What is the advantage of meniscus lens?

Meniscus lens are used to minimize spherical aberration and can achieve a smaller focus and less aberration than plano-convex lens to improve imaging quality.

Why is BK7 glass preferred for meniscus lens over other optical glasses?

BK7 offers a balance of low dispersion, high transmittance, and optical homogeneity—critical for aberration correction—while being cost-effective and widely available. Its mechanical and thermal stability also makes it suitable for diverse environments, unlike softer glasses (e.g., flint glass) that are prone to scratching.

Can BK7 meniscus lens be customized for high-volume consumer electronics?

Yes. We support mass production of custom BK7 meniscus lens, with tight tolerances for focal length and size to match consumer device specifications. Automated polishing and quality control ensure consistency across large batches.