67-642 20mm Dia. x 30mm 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
- 30 mm
- BFL
- 28.2 mm
- R1
- 30.08 mm
- R2
- -30.08 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
67-642 20mm Dia. x 30mm FL; NIR II Coated; Double-Convex Lens NIR II 750-1550nm
The 67-642 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 focal length of 30mm, 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 30.08mm on both the front and back surfaces. This geometry results in a high refractive power, making the lens ideal for imaging and light focusing applications.
The lens has an effective focal length (EFL) of 30mm, which is the distance from the lens's principal point to the focal point. The back focal length (BFL) is 28.2mm, which is the distance from the rear surface of the lens to the focal point. The lens has a thickness of 1.88mm at the edge and 5.3mm at the center.
The 67-642 lens is coated with Edmund Optics' NIR-II standard curve coating on both the front and back surfaces. This coating enhances the lens's performance in the near-infrared (NIR) spectrum, specifically between 750nm and 1550nm. The coating reduces surface reflections, improving transmission and enhancing the overall optical performance of the lens.