87-965 50 mm Dia. Germanium Positive Meniscus Lens; EFL=75mm BBAR 3-5µm
- Type
- Lens
- Subtype
- Spherical Lens (Convex-Concave)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 50 mm
- EFL
- 75 mm
- BFL
- 71.56 mm
- R1
- 81.89 mm
- R2
- 122.77 mm
Material
- Name
- Germanium
- Dispersion Equation
- Sellmeier
- n (λ)
- 4.00355628065046
- λ
- 10600 nm
- B1
- 0.4886331
- C1
- 1.393959 μm2
- B2
- 14.5142535
- C2
- 0.1626427 μm2
- B3
- 0.0091224
- C3
- 752.19 μm2
87-965 50 mm Dia. Germanium Positive Meniscus Lens; EFL=75mm BBAR 3-5µm
This is a 50 mm diameter Germanium positive meniscus lens, featuring an effective focal length (EFL) of 75mm and broadband anti-reflection (BBAR) coating for a wavelength of 10600 nm. The lens is sourced from the reputable vendor, Edmund Optics, and is currently in stock.
The lens is designed with a convex-concave geometry, making it a meniscus lens. The base shape is circular, and the lens is spherical, meaning it has a constant curvature throughout its surface. The edge thickness of the lens is 3.5 µm, while the center thickness is 5 µm. The lens's inner and outer radii are both zero, indicating a symmetrical design.
The lens's first radius of curvature (R1) is 81.89, and the second radius of curvature (R2) is 122.77. The back focal length (BFL) is 71.56, providing a clear image without vignetting.
The lens is made of Germanium burnett, a high-refractive-index material, making it suitable for infrared applications. The BBAR coating on both the front and back surfaces reduces surface reflections, enhancing transmission and improving overall system performance.