69-644 25mm Dia. x 150mm FL; Uncoated; Ge Plano-Convex Lens
- Type
- Lens
- Subtype
- Spherical Lens (Plano-Convex)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- 150 mm
- BFL
- 149.25 mm
- R1
- 450.58 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
69-644 25mm Dia. x 150mm FL; Uncoated; Ge Plano-Convex Lens
The 69-644 is a 25mm diameter, 150mm focal length plano-convex lens, sourced from Edmund Optics. This lens is made of germanium burnett, a material known for its excellent optical properties, particularly in the infrared spectrum. The lens's design features a spherical shape, with a plano surface on one side and a convex surface on the other.
The lens's geometry is meticulously crafted, with a 2.83mm edge thickness and a 3mm center thickness. The effective focal length (EFL) is 150mm, and the radius of curvature (R1) is 450.58mm. The back focal length (BFL) is 149.25mm, and both the inner and outer radii are 0mm, indicating a uniform curvature.
This lens is uncoated, which means it does not have any anti-reflective or other surface treatments. While this may result in higher reflectivity, it also means the lens is more cost-effective and suitable for applications where such coatings are not necessary.
The lens's wavelength compatibility is 10600nm, making it suitable for various infrared applications. It's important to note that this lens is designed for use in free space, not as an element in a lens system or optical instrument.