69-647 50mm Dia. x 75mm FL; Uncoated; Ge Plano-Convex Lens
- Type
- Lens
- Subtype
- Spherical Lens (Plano-Convex)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 50 mm
- EFL
- 75 mm
- BFL
- 74 mm
- R1
- 225.29 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
69-647 50mm Dia. x 75mm FL; Uncoated; Ge Plano-Convex Lens
The 69-647 is a 50mm diameter, 75mm focal length Plano-Convex lens, sourced from Edmund Optics. This lens is made of Germanium burnett, a material with a refractive index suitable for infrared wavelengths, specifically 10600nm. The lens has a base shape of a circle, with an inner radius of 0mm and an outer radius of 0mm, indicating a flat surface on one side and a curved surface on the other.
The curved surface of the lens has a radius of curvature of 225.29mm, contributing to a back focal length of 74mm. The lens's thickness at the edge is 2.61mm, while its center thickness is 4mm. The effective focal length (EFL) of the lens is 75mm, which is the distance from the lens's secondary focal point to its optical center.
This lens is uncoated, meaning it does not have any anti-reflective or other coatings applied to its surfaces. This may result in higher reflective losses and a lower transmission rate, but it also means the lens is less prone to damage from environmental factors or mishandling.
The lens's geometry and material make it suitable for use in infrared applications, such as thermal imaging or spectroscopy. However, its uncoated nature may require additional considerations for applications where high transmission and low reflectivity are critical.