45-929 20mm Dia. x -20mm FL; VIS-NIR Coated; Double-Concave Lens 400-1000nm
- Type
- Lens
- Subtype
- Spherical Lens (Concave-Concave)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- -20 mm
- BFL
- -20.55 mm
- R1
- -31.82 mm
- R2
- 31.82 mm
Material
- Name
- N-SF11
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.7847141030246312
- λ
- 587.6 nm
- B1
- 1.73759695
- C1
- 0.013188707 μm2
- B2
- 0.313747346
- C2
- 0.0623068142 μm2
- B3
- 1.89878101
- C3
- 155.23629 μm2
45-929 20mm Dia. x -20mm FL; VIS-NIR Coated; Double-Concave Lens 400-1000nm
The 45-929 is a double-concave spherical lens, characterized by its circular base shape and a diameter of 20mm. This lens is designed with a negative focal length (FL) of -20mm, making it a converging lens that brings light rays to a focus. The lens has a center thickness of 2mm and an edge thickness of 5.03mm, contributing to its robust construction.
The lens's geometry includes inner and outer radii of 0mm, with radii of curvature (R1 and R2) of -31.82mm and 31.82mm respectively. These parameters influence the lens's optical performance, determining how it bends and focuses light. The effective focal length (EFL) is -20.55mm, a value that describes the lens's overall optical power.
The lens is made from n-SF11 Schott, a high-index glass with excellent optical properties. This material is particularly suitable for applications in the visible to near-infrared spectrum, as indicated by its wavelength of 587.6nm.
The lens features a VIS-NIR coating, denoted as 'edm visnir0sp2002000' on both the front and back surfaces. This coating is designed to enhance the lens's performance in the visible and near-infrared regions, reducing surface reflections and improving transmission.