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LB1889-C N-BK7 Bi-Convex Lens; Dia:2 in; f=250.0 mm ARC 1050-1700nm

LB1889-C N-BK7 Bi-Convex Lens; Dia:2 in; f=250.0 mm ARC 1050-1700nm

Type
Lens
Subtype
Spherical Lens (Convex-Convex)
Brand
Thorlabs
Product webpage
Thorlabs products in the 3DOptix catalog

Properties

Shape
Circular
Diameter
50.8 mm
EFL
125 mm
BFL
248.2 mm
R1
256.6 mm
R2
-256.6 mm

Material

Name
N-BK7
Dispersion Equation
Sellmeier
n (λ)
1.5150823520020043
λ
633 nm
B1
1.03961212
C1
0.00600069867 μm2
B2
0.231792344
C2
0.0200179144 μm2
B3
1.01046945
C3
103.560653 μm2

LB1889-C N-BK7 Bi-Convex Lens; Dia:2 in; f=250.0 mm ARC 1050-1700nm

The LB1889-C is a high-quality bi-convex lens from Thorlabs, designed for use in a wide range of optical applications. This lens is fabricated from N-BK7 Schott glass, a popular material known for its excellent optical properties and versatility.

The lens features a diameter of 2 inches (50.8 mm) and a focal length of 250.0 mm, providing a beam divergence that is suitable for many applications. The lens has a double-convex shape, with radii of curvature of 256.6 mm for the first surface and -256.6 mm for the second surface. This shape allows for efficient light collection and focusing.

The LB1889-C is coated with Thorlabs' Broadband Anti-Reflection Coating (BBAR), which is designed to reduce surface reflections and increase transmission across the 1050-1700nm wavelength range. This coating ensures optimal performance in near-infrared applications.

The lens has a central thickness of 9.5 mm and an edge thickness of 3 mm, providing robustness and durability. The lens is also available with custom AR coatings upon request, allowing for tailored performance in specific applications.

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