67-643 20mm Dia. x 40mm FL; NIR II Coated; Double-Convex Lens NIR II 750-1550nm
- Type
- Lens
- Subtype
- Spherical Lens (Convex-Convex)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- 40 mm
- BFL
- 38.44 mm
- R1
- 40.67 mm
- R2
- -40.67 mm
Material
- Name
- N-BK7
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5167984379050088
- λ
- 587.6 nm
- B1
- 1.03961212
- C1
- 0.00600069867 μm2
- B2
- 0.231792344
- C2
- 0.0200179144 μm2
- B3
- 1.01046945
- C3
- 103.560653 μm2
67-643 20mm Dia. x 40mm FL; NIR II Coated; Double-Convex Lens NIR II 750-1550nm
The 67-643 is a high-quality double-convex lens, designed and manufactured by Edmund Optics, a leading global provider of optical components. This lens boasts a 20mm diameter and a 40mm focal length, making it suitable for a wide range of applications.
The lens is constructed from N-BK7 Schott glass, a popular material due to its excellent optical properties and versatility. The base shape of the lens is circular, and it features a double-convex geometry, with radii of curvature of 40.67mm on both sides. This geometry provides a high level of optical power and a compact design.
The lens has an effective focal length (EFL) of 40mm, which is the distance from the lens's principal point to the focal point. The back focal length (BFL) is 38.44mm, which is the distance from the lens's rear surface to the focal point. The center thickness of the lens is 5.3mm, while the edge thickness is 2.8mm, providing robustness and durability.
The lens is coated with Edmund Optics' standard NIR-II coating on both the front and back surfaces. This coating is specifically designed for the near-infrared (NIR) spectrum, covering the wavelength range of 750-1550nm. It enhances the lens's performance in the NIR region, improving transmission and reducing reflection.
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