68-001 25mm Dia. x -50 FL; NIR II Coated; Plano-Concave Lens 750-1550nm
- Type
- Lens
- Subtype
- Spherical Lens (Plano-Concave)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- -50 mm
- BFL
- -52.31 mm
- R1
- -25.84 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
68-001 25mm Dia. x -50 FL; NIR II Coated; Plano-Concave Lens 750-1550nm
The 68-001 is a 25mm diameter Plano-Concave Lens with a focal length of -50, sourced from Edmund Optics. This lens is designed for use in the near-infrared (NIR) spectrum, specifically between 750 and 1550nm, making it suitable for a wide range of applications in this region.
The lens is made from N-BK7 Schott glass, a popular choice for its high homogeneity, low optical dispersion, and excellent transmission properties in the visible and NIR spectra. The lens features a plano-concave geometry, with a 6.33mm thickness at the edge and 3.5mm at the center. The inner and outer radii are both 0, indicating a uniform curvature.
The 68-001 is coated with Edmund Optics' standard NIR-II coating on both the front and back surfaces. This coating is designed to enhance the lens's performance in the NIR spectrum, improving transmission and reducing reflection. According to the vendor, the coating provides a standard curve, although the specifics of this curve are not provided in the item data.