SLB-20B-30NIR2 20.0 mm Dia. x -29.7 mm FL; Coated; Double-Concave Lens 750-1550nm
- Type
- Lens
- Subtype
- Spherical Lens (Concave-Concave)
- Brand
- OptoSigma
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- -29.7 mm
- BFL
- -30.3 mm
- R1
- -31.14 mm
- R2
- 31.14 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-30NIR2 20.0 mm Dia. x -29.7 mm FL; Coated; Double-Concave Lens 750-1550nm
The SLB-20B-30NIR2 is a high-quality double-concave lens, designed and manufactured by OptoSigma. This lens is specifically engineered for use within the wavelength range of 750-1550nm, making it suitable for a variety of applications within the near-infrared spectrum.
The lens boasts a base shape of a circle, with a diameter of 20.0mm. The edge thickness measures at 5.3mm, while the center thickness is 2.0mm. The effective focal length (EFL) of this lens is -29.7mm, indicating its double-concave nature. The first radius of curvature (R1) is -31.14mm, and the second radius of curvature (R2) is 31.14mm, further emphasizing its concave-concave geometry.
The SLB-20B-30NIR2 is made from n-BK7 Schott, a popular material in optical systems due to its excellent optical properties and high Abbe number. This lens is coated with Opt IR2 on both the front and back surfaces, enhancing its performance within the specified wavelength range.
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