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67-640 20mm Dia. x 20mm FL; NIR II Coated; Double-Convex Lens NIR II 750-1550nm

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
Product webpage
Edmund Optics products in the 3DOptix catalog

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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