LF1988-A 25.4 mm Dia. N-BK7 Negative Meniscus Lens; EFL=-500mm 350-700nm
- Type
- Lens
- Subtype
- Spherical Lens (Concave-Convex)
- Brand
- Thorlabs
Properties
- Shape
- Circular
- Diameter
- 25.4 mm
- EFL
- -500 mm
- BFL
- -496.3 mm
- R1
- 250 mm
- R2
- 126.3 mm
Material
- Name
- N-BK7
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5167984379050088
- λ
- 587.6 nm
- B1
- 1.03961212
- C1
- 0.00600069867 μm2
- B2
- 0.231792344
- C2
- 0.0200179144 μm2
- B3
- 1.01046945
- C3
- 103.560653 μm2
LF1988-A 25.4 mm Dia. N-BK7 Negative Meniscus Lens; EFL=-500mm 350-700nm
The LF1988-A is a high-quality spherical lens from Thorlabs, featuring a concave-convex base shape and a circular geometry. With a diameter of 25.4 mm, this lens is designed for use in the ultraviolet, visible, and near-infrared regions of the spectrum, specifically optimized for use at a wavelength of 587.6 nm.
The lens is made from N-BK7 glass, a popular material in optical systems due to its excellent optical properties and wide transparency range. The lens features an effective focal length (EFL) of -500 mm, making it suitable for a variety of applications that require precise optical control.
The LF1988-A is equipped with THo A Bbar anti-reflection coatings on both the front and back surfaces, designed to reduce surface reflections and increase transmission in the 350-700 nm range. The center thickness of the lens is 3 mm, while the edge thickness is 3.3 mm, providing robustness and durability.
This lens is a negative meniscus lens, meaning it has a concave front surface and a convex rear surface. This design is often used in optical systems to correct spherical aberration or to focus light. The inner radius of the lens is 0, while the outer radius is also 0, indicating a symmetrical design.