Bi-concave lens element

BK7optical glassgermanium

The Bi-Concave / Double-concave Lens has a focal length, diverges collimated incident light, and forms only virtual images that are seen through the lens. It's often used to expand light beams or to increase focal length in existing systems, and is normally used in combination with other lenses, In a single lens application you should consider using them in preference to a single plano-concave lens if the magnification lies in the region. They are widely used in telescope, collimators, optical transceivers, magnifiers, radiometers and condensers. Cutting lenses like rectangle, step according to various requirements are available. Creator Optics can produce various bi-concave / double-concave lenses made of following materials: BK7 glass and all catalog optical glass, Sapphire crystal, Quartz crystal, Germanium ( Ge ) monocrystal, Silicon monocrystal, ZnSe,Barium Fluoride ( BaF2 ), Calcium Fluoride ( CaF2 ), ZnS, Pyrex, BOROFLOAT, float glass, etc. - Surface Quality: 80/50, 60/40, 40/20, 20/10, 10/5. - Coating: We provide different single layer or multiplayer anti-reflecting (AR) coating against differrent requirements. Customized available.