68-015 25mm Dia. x -25mm FL; NIR II Coated; Double-Concave Lens 750-1550nm
- Type
- Lens
- Subtype
- Spherical Lens (Concave-Concave)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- -25 mm
- BFL
- -25.69 mm
- R1
- -39.78 mm
- R2
- 39.78 mm
Material
- Name
- N-SF11
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.7847141030246312
- λ
- 587.6 nm
- B1
- 1.73759695
- C1
- 0.013188707 μm2
- B2
- 0.313747346
- C2
- 0.0623068142 μm2
- B3
- 1.89878101
- C3
- 155.23629 μm2
68-015 25mm Dia. x -25mm FL; NIR II Coated; Double-Concave Lens 750-1550nm
The 68-015 is a double-concave lens with a diameter of 25mm and a focal length of -25mm, making it a powerful tool for applications that require a highly curved optical path. This lens is sourced from Edmund Optics, a reputable vendor known for their high-quality optical components.
The lens is made from n-SF11 Schott, a high-index glass with excellent optical properties. This material is particularly suitable for use in the near-infrared (NIR) region, as indicated by the NIR II coating on both the front and back surfaces. This coating is designed to enhance the lens' performance in the 750-1550nm wavelength range, making it ideal for a wide range of NIR applications.
The geometry of the lens is carefully designed to provide optimal performance. The inner and outer radii are both zero, indicating a simple spherical shape. The thickness at the edge of the lens is 6.05mm, while the thickness at the center is 2.5mm. The back focal length (BFL) is -25.69mm, slightly longer than the focal length due to the curvature of the lens.