LF5895-E 25.4 mm Dia. CaF2 Negative Meniscus Lens; EFL=-75mm 2-5µm
- Type
- Lens
- Subtype
- Spherical Lens (Concave-Convex)
- Brand
- Thorlabs
Properties
- Shape
- Circular
- Diameter
- 25.4 mm
- EFL
- -75 mm
- BFL
- -72.2 mm
- R1
- 30.8 mm
- R2
- 14.8 mm
Material
- Name
- CaF2
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.4096399504333625
- λ
- 4000 nm
- B1
- 0.5675888
- C1
- 0.00252643 μm2
- B2
- 0.4710914
- C2
- 0.010078333 μm2
- B3
- 3.8484723
- C3
- 1200.555973 μm2
LF5895-E 25.4 mm Dia. CaF2 Negative Meniscus Lens; EFL=-75mm 2-5µm
The LF5895-E is a spherical lens with a concave-convex base shape and a circular design, sourced from the reputable vendor Thorlabs. This lens boasts a 25.4 mm diameter and a negative meniscus shape, making it an ideal choice for specific optical applications.
The lens's geometry includes an 8.5 mm thickness at the edge, reducing to 4 mm at the center, and an effective focal length (EFL) of -75 mm. The first radius of curvature (R1) is 30.8 mm, while the second radius (R2) measures 14.8 mm. The back focal length (BFL) is -72.2 mm, and both the inner and outer radii are 0 mm.
This lens is crafted from Calcium Fluoride (CaF2) material, identified as "caf2 mal-1963" in the material ID. It is designed to operate at a wavelength of 4000 nm. The lens features a coating on both the front and back surfaces, specifically the "tho ecaf2arc20005000" coating, which enhances its performance and durability.
