• Material: BK7
• Wavelength Range: 350 nm - 2.0 μm

Thorlabs BK7 Plano-Convex Lenses are popular for many applications. Plano-Convex lenses have a positive focal length and near best form shape for infnite and finite conjugate applications. Please see the link above for details concerning Best Form Lenses. These lenses focus a collimated beam to the back focus and collimate light from a point source. They are designed with minimal spherical aberration and have a focal length f= R/(n-1) where n is the index of refraction and R is the radius of curvature of the lens surface .

BK7 has an Abbe Number of 64.17, which is an indicator of the dispersion.

An Antireflection Coating can reduce the amount of light reflected from each surface of the lens. Thorlabs BK7 Lenses are available with our standard -A, -B, -C Broadband Antireflection Coating (please see Graphs tab for coating details).