The biconvex lens is a convergent lens with two outwardly curved surfaces, which are symmetrical. Its radius of curvature is equal. The spherical aberration, coma and distortion of biconvex lenses reach the minimum. In addition to controlling laser beams in lasers, biconvex lenses are also used for optical imaging systems or other optical instruments.
N-BK7 Bi-Convex Lenses
N-BK7 (Equivalent Material CDGM H-K9L) is crown glass with a transmission range of visible light and near-infrared spectrum (350nm-2000nm). N-BK7 possesses excellent optical, mechanical and chemical properties and is cost-effective. N-BK7 double convex lenses are often used in various optical imaging systems.
Fused Silica Bi-Convex Lenses
Between 185-2500nm, fused silica biconvex lenses have good transmittance. Fused silica has stable chemical properties, high-temperature resistance, low laser damage threshold. It is suitable for laser optical systems.
Silicon Bi-Convex Lenses
Silicon has metallic luster and is blocked in the visible light band. It has good transmittance in the infrared band (3-5μm). As a commonly used infrared optical material, silicon has high refractive index and small dispersion. Silicon lenses are widely used in infrared missile optical systems.
