LB7887-E3 25.4 mm Dia. ZnSe Double-Convex Lens; EFL=200mm 7-12µm
- Type
- Lens
- Subtype
- Spherical Lens (Convex-Convex)
- Brand
- Thorlabs
Properties
- Shape
- Circular
- Diameter
- 25.4 mm
- EFL
- 200 mm
- R1
- 560.4 mm
- R2
- -560.4 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
LB7887-E3 25.4 mm Dia. ZnSe Double-Convex Lens; EFL=200mm 7-12µm
The LB7887-E3 is a high-quality spherical lens from Thorlabs, designed for use in the 7-12 µm wavelength range. This lens, with a base shape of a circle, features a double-convex geometry, offering excellent optical performance. The lens has a diameter of 25.4 mm and a thickness of 2 mm at the edge, while the center thickness is slightly more at 2.3 mm.
The effective focal length (EFL) of this lens is 200 mm, making it suitable for applications that require a longer focal length. The first radius of curvature (R1) is 560.4 mm, and the second radius of curvature (R2) is -560.4 mm, indicating a concave-convex shape. The lens does not have an inner or outer radius.
The LB7887-E3 is made from ZnSe (Zinc Selenide) material, identified as "znse connolly" in the material ID. This material is known for its excellent transmission properties in the infrared region, making it ideal for applications in this spectrum.
The lens is coated with E3ZnSeARC, a broadband anti-reflection coating designed for ZnSe optics in the 7-12 µm range. This coating helps to reduce surface reflections, improving the overall transmission of the lens.
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