Bi-concave lens element

optical glassopticalwith anti-reflective coating

Warranty: 3 months Customized support: OEM Place of Origin: Jilin, China Brand Name: YT Model Number: YT-coating concave lens with hole Use: Optical Structure: Singlet Shape: Spherical Size: None Weight: 0.05 Product name: spherical coating concave lens with hole Material: optical glass Diameter: 30mm 50.8mm 70mm etc. Focal length: as requirements Surface quality: 60/40 Flatness: L/2 Centration: 3 arc minutes Tolerance: +-0.1mm Chamfer: 0.25mm*45 degree Feature: make holes as request. Plano concave lens Bi-concave lenses have a negative focal length and are best used to diverge a converging beam. Bi-concave lenses can diverge a collimated beam to a virtual focus and are commonly used in Galilean-type beam expanders.Bi-concave lenses with AR coating will increased the transmission of the light for the coating wavelength. Changchun Yutai Optics Co., Ltd. can supply double concave lenses in diameter 12.7mm 25.4mm 38.1mm and so on. Also it is available to arrange hole, notch and cut as request.