89-615 50mm Dia. Germanium Infrared Aspheric Lens; EFL=25mm; NA=1 BBAR 3-12µm
- Type
- Lens
- Subtype
- Aspheric Lens
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 50 mm
- EFL
- 25 mm
- BFL
- 20.64 mm
- R1
- 33.38 mm
- R2
- 49.34 mm
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
89-615 50mm Dia. Germanium Infrared Aspheric Lens; EFL=25mm; NA=1 BBAR 3-12µm
This is the 89-615 model from Edmund Optics, a 50mm diameter Germanium Aspheric Lens designed for infrared applications with a wavelength of 4000nm. The lens boasts an effective focal length (EFL) of 25mm and a numerical aperture (NA) of 1, indicating a high light-gathering capability. The lens is coated with BBAR 3-12µm, ensuring excellent transmission and minimal reflection across the specified infrared spectrum.
The lens geometry is meticulously designed with an inner radius of 0mm, an outer radius of 0mm, and a thickness at the edge of 2.5mm. The center thickness is 7.75mm, and the lens features a front diameter of 50mm. The aspheric design, characterized by the radii r1 and r2 of 33.384mm and 49.34mm respectively, ensures superior image quality by minimizing spherical aberration.
The lens is coated on both the front and back surfaces with "edm arcedgermanium31", a coating specifically designed for Germanium lenses to enhance their performance in the infrared spectrum. This coating helps to reduce surface reflections, thereby improving transmission and image quality.
