LB1904-B N-BK7 Bi-Convex Lens; Dia:1 in; f=125.0 mm ARC 650-1050nm
- Type
- Lens
- Subtype
- Spherical Lens (Convex-Convex)
- Brand
- Thorlabs
Properties
- Shape
- Circular
- Diameter
- 25.4 mm
- EFL
- 125 mm
- BFL
- 123.9 mm
- R1
- 128.2 mm
- R2
- -128.2 mm
Material
- Name
- N-BK7
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5150823520020043
- λ
- 633 nm
- B1
- 1.03961212
- C1
- 0.00600069867 μm2
- B2
- 0.231792344
- C2
- 0.0200179144 μm2
- B3
- 1.01046945
- C3
- 103.560653 μm2
LB1904-B N-BK7 Bi-Convex Lens; Dia:1 in; f=125.0 mm ARC 650-1050nm
The LB1904-B N-BK7 Bi-Convex Lens is a high-quality optical component sourced from Thorlabs, a leading vendor in the field of precision photonics. This lens, with a diameter of 1 inch, is designed for use in the wavelength range of 650-1050nm, making it suitable for a wide range of applications in the near-infrared spectrum.
The lens features a bi-convex geometry, meaning it has two spherical surfaces that are both convex, or curved outward. This design is often used to achieve a specific focal length, which in this case is 125mm. The lens's effective focal length (EFL) is 123.9mm, a slight deviation from the stated focal length due to the lens's thickness.
The lens is made from N-BK7, a type of borosilicate glass known for its excellent optical properties. This material is often used in high-precision optical systems due to its low coefficient of thermal expansion and high homogeneity. The lens's front and back surfaces are coated with a broadband anti-reflection coating (ARC), specifically designed for the 650-1050nm range. This coating reduces surface reflections, thereby increasing the amount of light transmitted through the lens.
The lens's geometry includes a diameter of 25.4mm, with a center thickness of 3.3mm and an edge thickness of 2mm. The inner and outer radii are not specified, indicating that they are not a significant factor in the lens's performance or application.
