Micro Concave Lens Optical Lenses are optical components designed to focus or diverge light. Optical Lenses, which may consist of a single or multiple elements, are used in a wide variety of applications from microscopy to laser processing. Worldhawk can supply Plano Convex Lens, Double Convex Lens , Plano Concave Lens, Double Concave Lens, Meniscus Lens, Achromatic Lens and aspheric Lens. Optical glass lenses have a wide variety of applications. Germanium (Ge), Silicon (Si), or Zinc Selenide (ZnSe) lenses are ideal for transmitting the Infrared (IR) spectrum, while Fused Silica is well suited for the Ultraviolet (UV). Parameter Material N-BK7, H-K9L, Fused Silica, H-ZF52A, Silicon, MgF2, CaF2, Sapphire, ZnSe, ZnS, etc. Diameter Tolerance +/-0.1mm, +/-0.01mm Center Thickness Tolerance +/-0.1mm, +/-0.01mm Focal Length Tolerance ±1% Centration <3 arc min,<1 arc min Clear Aperture >90% Flatness <1.5Lambda (General),