LD1170-C N-BK7 Bi-Concave Lens; Dia:25.4 mm; f=-75.0 mm ARC 1050-1700nm
- Type
- Lens
- Subtype
- Spherical Lens (Concave-Concave)
- Brand
- Thorlabs
Properties
- Shape
- Circular
- Diameter
- 25.4 mm
- EFL
- -75 mm
- BFL
- -75.9 mm
- R1
- -77.9 mm
- R2
- 77.9 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
LD1170-C N-BK7 Bi-Concave Lens; Dia:25.4 mm; f=-75.0 mm ARC 1050-1700nm
The LD1170-C is a high-quality bi-concave lens from Thorlabs, designed with a base shape of a circle and a sub-type of spherical lens. This lens is constructed from n-BK7 Schott, a popular optical glass due to its excellent optical properties. The lens has a diameter of 25.4 mm and a thickness at the edge of 5.6 mm, while the center thickness is 3.5 mm.
The lens's effective focal length (EFL) is -75 mm, indicating its diverging nature. The first radius of curvature (R1) is -77.9 mm, and the second radius of curvature (R2) is 77.9 mm. The back focal length (BFL) is -75.9 mm. The lens's design is optimized for a wavelength of 587.6 nm.
The LD1170-C lens comes with anti-reflection coating (ARC) for the wavelength range of 1050-1700 nm on both the front and back surfaces. This coating helps to reduce surface reflections, thereby increasing the transmission of light through the lens. The lens's shape is spherical, which is a common choice for many optical applications due to its ease of manufacturing and good optical performance.