67-640 20mm Dia. x 20mm 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
- 20 mm
- BFL
- 18.55 mm
- R1
- 30.25 mm
- R2
- -30.25 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
67-640 20mm Dia. x 20mm FL; NIR II Coated; Double-Convex Lens NIR II 750-1550nm
The 67-640 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 20mm focal length, making it suitable for a wide range of applications.
The lens is constructed from n-SF11 Schott, a highly transparent glass with excellent optical properties. This material is particularly suited for use in the near-infrared (NIR) spectrum, with a wavelength of 587.6nm. The lens is coated with Edmund Optics' NIR-II standard curve coating on both the front and back surfaces, enhancing its performance in the NIR range of 750-1550nm.
The geometry of the lens is carefully designed to optimize its optical performance. The lens has a center thickness of 5mm and an edge thickness of 1.6mm, providing a balance between weight and durability. The front and back radii of the lens are 30.25mm and -30.25mm respectively, creating a double-convex shape that focuses light effectively. The back focal length is 18.55mm, and the effective focal length is 20mm.
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