67-989 9.0mm Dia. x -18 FL; NIR II Coated; Plano-Concave Lens 750-1550nm
- Type
- Lens
- Subtype
- Spherical Lens (Plano-Concave)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 9 mm
- EFL
- -18 mm
- BFL
- -19.26 mm
- R1
- -14.12 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
67-989 9.0mm Dia. x -18 FL; NIR II Coated; Plano-Concave Lens 750-1550nm
This is a 67-989 Plano-Concave Lens, a spherical lens with a 9.0mm diameter, sourced from the renowned optical components vendor, Edmund Optics. The lens is designed with a base shape of a circle and features a negative focal length (FL) of -18, making it a concave lens.
The lens's geometry is meticulously crafted, with a thickness of 2.89mm at the edge and 2.25mm at the center. The back focal length (BFL) is -19.26mm, and the inner and outer radii are both zero, indicating a plano surface.
The lens is made from n-SF11 Schott, a high-index glass with excellent transmittance in the near-infrared (NIR) region. This is further enhanced by the NIR II coating, which is applied to both the front and back surfaces. This coating is standard from Edmund Optics and is designed to provide high transmission in the 750-1550nm wavelength range.
