68-252 25mm Dia. Germanium Infrared Aspheric Lens; EFL=15mm; NA=0.83 BBAR 8-12µm
- Type
- Lens
- Subtype
- Aspheric Lens
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- 15 mm
- BFL
- 14 mm
- R1
- 45.37 mm
- R2
Material
- Name
- Germanium
- Dispersion Equation
- Sellmeier
- n (λ)
- 4.024720747638282
- λ
- 4000 nm
- B1
- 0.4886331
- C1
- 1.393959 μm2
- B2
- 14.5142535
- C2
- 0.1626427 μm2
- B3
- 0.0091224
- C3
- 752.19 μm2
68-252 25mm Dia. Germanium Infrared Aspheric Lens; EFL=15mm; NA=0.83 BBAR 8-12µm
This is the 68-252 model from Edmund Optics, a 25mm diameter Germanium Aspheric Lens designed for infrared applications with a wavelength of 4000nm. The lens boasts an effective focal length (EFL) of 15mm and a numerical aperture (NA) of 0.83, making it a high-performance option for a variety of optical systems.
The lens is made from Germanium burnett, a material known for its excellent transmission properties in the infrared spectrum. It features a broadband anti-reflection (BBAR) coating, specifically designed for the 8-12µm range, which further enhances its performance by reducing surface reflections and increasing transmission.
The lens geometry includes a 2.47mm thickness at the edge, a 14mm back focal length (BFL), and a 4mm thickness at the center. The aspheric design of the lens helps to minimize spherical aberration, providing superior image quality over a wider range of applications.
The coating on both the front and back surfaces of the lens is edm arcedgermanium81, which is specifically designed for Germanium lenses and provides excellent durability and resistance to environmental conditions.
