Double Convex Lenses, also known as Biconvex lenses, are essential optical devices characterized by their elegant design that features two outward-curving convex surfaces. These surfaces, originating from a central point, possess consistent curvature radii, enabling the lens to effectively converge parallel light rays and focus them to a single focal point located beyond the lens. This distinctive quality has diverse applications in various imaging instruments such as microscopes, cameras, telescopes, and image relays. In these instruments, biconvex lenses play a crucial role in capturing intricate details and distant scenes.

Furthermore, the versatility of Double Convex (Biconvex) Lenses extends into the forefront of modern technology. Their proficiency in focusing and steering laser beams highlights their importance in laser technology, enabling precise control and diverse applications across industries and cutting-edge research. Additionally, these lenses hold significant value in the fields of telecommunications and infrared technologies. They facilitate the manipulation and transmission of light signals, contributing to seamless communication and advancements in infrared applications – from remote sensing to medical diagnostics.

Biconvex / Double Convex Lenses
Biconvex / Double Convex Lenses
Double Convex Lenses, Double Spherical Lenses

Biconvex / Double Convex Lenses

At the forefront of this pursuit, Avantier Inc. emerges as a leading manufacturer of double convex (biconvex) lenses. The company offers both coated and uncoated variants to address a wide range of beam-focusing needs. The synergy between the inherent properties of double convex (biconvex) lenses and Avantier Inc.’s dedication to quality underscores their essential role in shaping the present and future of optics and technology.

Biconvex / Double Convex Lenses

The figure above shows a point light-source located at the focal point of a biconvex lens.

Utilizations of Double Convex (Biconvex) Lenses

While double convex (biconvex) lenses are inherently straightforward optical components, they often find themselves integrated into extensive multi-lens configurations. Our double convex (biconvex) lenses are especially well-suited for scenarios where object and virtual images reside on opposite sides of the lens. Ideally, the relationship between image and object distances, known as conjugate ratios, should fall within the range of 0.2 to 5. Achieving equidistance from the lens (1:1 conjugate ratio) between the image and object minimizes distortions, chromatic aberration, and spherical aberration. For imaging more distant objects, plano-convex lenses might be preferable.

Specifications of Double Convex (Biconvex) Lenses

Critical specifications for a double convex (biconvex) lens encompass the choice of substrate or optical material, focal length, diameter, and radius of curvature. The optical material governs the lens’s resilience and optical traits, such as refractive index.

The focal length of a double convex (biconvex) lens quantifies the distance between the lens and the focal point along the focal axis. This measurement depends on the optical material and the lens’s curvature radius.

Radius of curvature is gauged as the distance between the lens surface’s vertex and the center of curvature along the optical axis. The two convex surfaces of a double convex (biconvex) lens exhibit radii of curvature with equal absolute values but different signs.

Double Convex (Biconvex) Lenses at Avantier

At Avantier Inc., we craft biconvex or double convex lenses utilizing substrates like K9 borosilicate crown glass, BK7 Schott glass, quartz, sapphire, fused silica, CaF2, ZnSe, and germanium. Each lens undergoes meticulous polishing to attain optimal surface quality and the edges have ground edges and are beveled. Our selection includes biconvex lenses suitable for UV, visible, and NIR spectra. Our factory-standard, in-stock lenses maintain a diameter tolerance of ±0.01mm and a flatness of λ/10.

Each Avantier Inc. lens undergoes rigorous testing to ensure compliance with relevant standards, employing cutting-edge metrology equipment. Our quality assurance processes entail thorough checks before each piece leaves our facility, instilling full confidence that the optics you acquire will impeccably serve your applications.

Double Convex (Biconvex) Lenses Specifications

Focal Length Tolerance


Diameter Tolerance


Thickness Tolerance


Design Wavelength




Surface Quality

40-20 scratch-dig


Fine ground and beveled

In addition to our large catalogue of in-stock products, we are also able to supply custom lenses upon request. Please contact us to discuss manufacturing limits and custom options, or to receive an up-to-date catalogue of on-shelf options.

Contact us today for assistance with your custom double convex (biconvex) lens project.

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