SLB-25.4B-70NIR2 25.4 mm Dia. x -69.7 mm FL; Coated; Double-Concave Lens 750-1550nm
- Type
- Lens
- Subtype
- Spherical Lens (Concave-Concave)
- Brand
- OptoSigma
Properties
- Shape
- Circular
- Diameter
- 25.4 mm
- EFL
- -69.7 mm
- BFL
- -70.4 mm
- R1
- -72.66 mm
- R2
- 72.66 mm
Material
- Name
- N-BK7
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.518720636186463
- λ
- 546.1 nm
- B1
- 1.03961212
- C1
- 0.00600069867 μm2
- B2
- 0.231792344
- C2
- 0.0200179144 μm2
- B3
- 1.01046945
- C3
- 103.560653 μm2
SLB-25.4B-70NIR2 25.4 mm Dia. x -69.7 mm FL; Coated; Double-Concave Lens 750-1550nm
OptoSigma's SLB-25.4B-70NIR2 is a high-quality double-concave lens, designed with a base shape of a circle and a spherical geometry. This lens has a diameter of 25.4 mm and a center thickness of 2 mm, with an edge thickness of 4.2 mm. The effective focal length (EFL) of this lens is -69.7 mm, making it a powerful tool for various optical applications.
The lens is made from n-BK7 Schott, a popular optical glass due to its excellent optical properties and versatility. The double-concave design, with radii of curvature of -72.66 mm for the first surface and 72.66 mm for the second, contributes to its unique optical characteristics. The back focal length (BFL) is -70.4 mm, and the lens has no inner or outer radius.
This lens is designed to operate within the wavelength range of 546.1 nm, making it suitable for a wide range of applications. The lens comes with a coating of opt IR2 on both the front and back surfaces, enhancing its performance in the infrared spectrum, specifically between 750 nm and 1550 nm.