Plano-convex lens element GCL-L01 series

BK7fused silicavisible

The UV fused silica has better homogeneity and a lower coefficient of thermal expansion than N-BK7. It offers high transmission and exhibits anti-damage properties in the ultraviolet to near-infrared region. The GCL-0108 series is uncoated. The GCL-L011 and GCL-L012 series are coated with a type A coating (broadband multi-layer anti-reflection in the range of 450-800nm) and a type B coating (broadband multi-layer anti-reflection in the range of 800-1100nm), and they are applicable to most imaging applications. Lens is an optical device with perfect or approximate axial symmetry which　transmits and refracts light, converging or diverging light. There are many forms of a lens or a lens system. A simple lens consists of a single optical element. A compound lens or a lens system has a series of simple lenses (elements) with a common axis in order to correct optical aberrations to improve performances or image quality, of which a simple single lens cannot offer. Single lenses are classified by the curvatures of its two optical surfaces. A lens that has its both surfaces convex, is called biconvex (or double convex). When the radii of curvature of the surfaces are the same, the lens is equi-convex. If one of the surfaces is flat, i.e. the radius of curvature is infinitive, the lens is plano-convex. Similarly, there are lenses that are biconcave, equi-concave and plano-concave if the lens surface is concave. A lens with one convex and concave side is convex-concave, or often called a meniscus lens.