Bi-concave lens element

optical glassfused silicacrystal

VIS-NIR Coated Double-Concave (DCV) Lenses Double Concave Lenses are used in beam expansion, image reduction, or light projection applications. These lenses are also ideal for expanding the focal length of an optical system. Double Concave Lenses, which have two concave surfaces, are Optical Lenses with negative focal lengths. Uni-Optics offers Double Concave lenses with a variety of coating options. Product Origin:China Shipping Port:Fuzhou China Lead Time:4 working weeks Payment:T/T Payment, Western Union 1. What is Biconcave lens? Double Concave lenses(biconcave lens) are manufactured with two concave surfaces to provide a negative focal length. The lens is also called a negative or diverging lens. 2.What is biconcave lens used for? These lenses are normally used in applications that require to expand light beams or to increase focal lengths. Such as Beam Expanders, Projection lenses, viewers, Medical Ophthalmic Detection... and so on. 3. What can UNI Optics do? UNI Optics as a developing and responsible optical component & assembly manufacturers from China, produces high quality Biconvex lenses out of many variations of optical glass, fused silica, crystal and Infrared materials, and with the aid of the cutting-edge thin film technology. Material: Optical glass/Fused Silica Design wavelength: 546.1nm Diameter tolerance: +0/-0.05mm Focal tolerance: +/-2% Surface quality : 40-20 S/D Centration: 1 arcmin Surface flatness: N=3 △N=0.5 Clear aperture: 90% Bevel: Protective Coating Optional Single layer MgF2 Multiple layers BBAR coating Designed for 0° Angle of Incidence