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LF5961 25.4 mm Dia. CaF2 Negative Meniscus Lens; EFL=-200mm Uncoated

LF5961 25.4 mm Dia. CaF2 Negative Meniscus Lens; EFL=-200mm Uncoated

Type
Lens
Subtype
Spherical Lens (Concave-Convex)
Brand
Thorlabs
Product webpage
Thorlabs products in the 3DOptix catalog

Properties

Shape
Circular
Diameter
25.4 mm
EFL
-200 mm
BFL
-197.3 mm
R1
86.2 mm
R2
41.4 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

LF5961 25.4 mm Dia. CaF2 Negative Meniscus Lens; EFL=-200mm Uncoated

The LF5961 is a spherical lens with a concave-convex base shape and a circular geometry, sourced from Thorlabs. This lens has a diameter of 25.4 mm and a thickness of 5.1 mm at the edge, tapering down to 4 mm at the center. The effective focal length (EFL) of this lens is -200 mm, making it a negative meniscus lens.

The lens is made of Calcium Fluoride (CaF2) with the material ID mal-1963. It is designed to operate at a wavelength of 4000 nm. The lens's first radius of curvature (r1) is 86.2 mm, while the second radius of curvature (r2) is 41.4 mm. The back focal length (bfl) of this lens is -197.3 mm.

Notably, this lens does not have any coating, as indicated in the item data. This could affect its performance in certain applications, particularly those requiring high transmission or resistance to environmental factors. Therefore, users should consider this factor when deciding whether this lens is suitable for their needs.

The lens's web links are valid and indicate that it is in stock, making it readily available for immediate use. This lens could be an excellent choice for users looking for a high-quality, uncoated negative meniscus lens for their optical systems.

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