LD2297-B N-SF11 Bi-Concave Lens; Dia:25.4 mm; f=-25.0 mm ARC 650-1050nm
- Type
- Lens
- Subtype
- Spherical Lens (Concave-Concave)
- Brand
- Thorlabs
Properties
- Shape
- Circular
- Diameter
- 25.4 mm
- EFL
- -25 mm
- BFL
- -25.6 mm
- R1
- -39.6 mm
- R2
- 39.6 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
LD2297-B N-SF11 Bi-Concave Lens; Dia:25.4 mm; f=-25.0 mm ARC 650-1050nm
The LD2297-B is a high-quality bi-concave lens offered by Thorlabs, a leading global manufacturer of photonics components. This lens is designed with a spherical surface on both sides, featuring a base shape of a circle. The lens has a diameter of 25.4 mm and a thickness of 7.2 mm at the edge, while the center thickness is 3 mm.
The lens's effective focal length (EFL) is -25 mm, indicating that it is a diverging lens, causing incoming light rays to spread out. The back focal length (BFL) is -25.6 mm, and the radius of curvature for both surfaces is -39.6 mm, contributing to the lens's diverging properties.
The LD2297-B is made of N-SF11 Schott glass, a high-index, low-dispersion material often used in applications where high numerical aperture (NA) and excellent optical performance are required. This lens is designed to work within the wavelength range of 650-1050 nm, making it suitable for near-infrared (NIR) applications.
The lens features broadband anti-reflection (BBAR) coatings on both the front and back surfaces, with a specified range of 650-1050 nm. These coatings help minimize surface reflections, thereby increasing transmission and improving overall system performance.