LB1889-B N-BK7 Bi-Convex Lens; Dia:2 in; f=250.0 mm ARC 650-1050nm
- Type
- Lens
- Subtype
- Spherical Lens (Convex-Convex)
- Brand
- Thorlabs
Properties
- Shape
- Circular
- Diameter
- 50.8 mm
- EFL
- 250 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-B N-BK7 Bi-Convex Lens; Dia:2 in; f=250.0 mm ARC 650-1050nm
The LB1889-B 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, a popular borosilicate glass known for its excellent optical properties, making it an ideal choice for applications that require high-performance lensing.
The lens features a diameter of 2 inches (50.8 mm) and a focal length of 250.0 mm. The bi-convex design, characterized by two spherical surfaces that curve outwards, provides a high degree of focusing power. This design is particularly useful in applications where a tight focus is required, such as in microscopy or beam shaping.
The lens has a central thickness of 5.5 mm and an edge thickness of 3 mm, providing robustness and durability. The edges are also rounded, reducing the risk of damage during handling and installation.
The LB1889-B is coated with Thorlabs' Broadband Anti-Reflection coating, which is designed to minimize surface reflections and increase transmission across the 650-1050 nm spectral range. This coating ensures optimal performance in a variety of applications, including laser systems, bio-imaging, and spectroscopy.
