45-921 20mm Dia. x -50 FL; VIS-NIR Coated; Plano-Concave Lens 400-1000nm
- Type
- Lens
- Subtype
- Spherical Lens (Plano-Concave)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- -50 mm
- BFL
- -52.31 mm
- R1
- -25.84 mm
Material
- Name
- N-BK7
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5167984379050088
- λ
- 587.6 nm
- B1
- 1.03961212
- C1
- 0.00600069867 μm2
- B2
- 0.231792344
- C2
- 0.0200179144 μm2
- B3
- 1.01046945
- C3
- 103.560653 μm2
45-921 20mm Dia. x -50 FL; VIS-NIR Coated; Plano-Concave Lens 400-1000nm
The 45-921 is a Plano-Concave Lens with a 20mm diameter and a -50 focal length, sourced from Edmund Optics. This lens is designed for use in the visible to near-infrared spectrum, spanning 400-1000nm.
The lens is made from n-BK7 Schott, a popular optical glass due to its excellent optical properties and relatively low cost. The front and back surfaces of the lens are coated with edm visnir0sp2002000, a broadband anti-reflection coating designed for the visible to near-infrared range. This coating reduces surface reflections, improving transmission and overall performance.
The lens has a thickness of 5.21mm at the edge and 3.5mm at the center. The inner and outer radii are 0mm, indicating a flat surface on one side and a curved surface on the other. The back focal length is -52.31mm, slightly longer than the specified focal length due to the thickness of the lens.
This lens is ideal for applications that require a concave lens in the visible to near-infrared spectrum. Its high-quality coating and reliable construction make it a suitable choice for various optical systems.