SLB-20B-25NIR2 20.0 mm Dia. x -24.7 mm FL; Coated; Double-Concave Lens 750-1550nm
- Type
- Lens
- Subtype
- Spherical Lens (Concave-Concave)
- Brand
- OptoSigma
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- -24.7 mm
- BFL
- -25.3 mm
- R1
- -25.95 mm
- R2
- 25.95 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-20B-25NIR2 20.0 mm Dia. x -24.7 mm FL; Coated; Double-Concave Lens 750-1550nm
The SLB-20B-25NIR2 is a high-quality double-concave lens, designed and manufactured by OptoSigma. This lens, with a diameter of 20.0 mm, is specifically engineered for use within the wavelength range of 750-1550nm, making it ideal for near-infrared applications.
The lens features a base shape of a circle, with a center thickness of 2mm and an edge thickness of 6mm. The effective focal length (EFL) is -24.7mm, and the back focal length (BFL) is -25.3mm. The radii of curvature for the first and second surfaces are -25.95mm and 25.95mm, respectively. The lens is made from n-BK7 Schott, a popular optical glass known for its excellent optical properties.
The SLB-20B-25NIR2 is coated with Opt IR2, a proprietary coating developed by OptoSigma. This coating is applied to both the front and back surfaces of the lens, enhancing its performance within the specified wavelength range. The coating reduces surface reflections, improving transmission and overall image quality.