LF7639-F 25.4 mm Dia. ZnSe Negative Meniscus Lens; EFL=-500mm 8-12µm
- Type
- Lens
- Subtype
- Spherical Lens (Concave-Convex)
- Brand
- Thorlabs
Properties
- Shape
- Circular
- Diameter
- 25.4 mm
- EFL
- -500 mm
- BFL
- -492 mm
- R1
- 146.1 mm
- R2
- 119 mm
Material
- Name
- ZnSe
- Dispersion Equation
- Sellmeier
- n (λ)
- 2.402780893783937
- λ
- 10600 nm
- B1
- 4.45813734
- C1
- 0.040344681 μm2
- B2
- 0.467216334
- C2
- 0.15317139 μm2
- B3
- 2.8956629
- C3
- 2221.822369 μm2
LF7639-F 25.4 mm Dia. ZnSe Negative Meniscus Lens; EFL=-500mm 8-12µm
The LF7639-F is a spherical lens with a base shape of a circle, sourced from the reputable vendor Thorlabs. This lens is a ZnSe (Zinc Selenide) material type, specifically identified as 'znse connolly'. The lens has a diameter of 25.4 mm and a thickness at the edge of 4.1 mm, while the center thickness is 4 mm.
The effective focal length (EFL) of this lens is -500mm, indicating that it is a negative meniscus lens. The first radius of curvature (r1) is 146.1 mm, and the second radius of curvature (r2) is 119 mm. The back focal length (bfl) is -492 mm. The lens does not have an inner or outer radius.
This lens is designed to operate at a wavelength of 10600 nm. It comes with anti-reflection coatings on both the front and back surfaces, specifically 'tho znse-arced 8-12'. This coating is optimized for the 8-12 µm spectral range.
