68-013 12mm Dia. x -24mm FL; NIR II Coated; Double-Concave Lens 750-1550nm
- Type
- Lens
- Subtype
- Spherical Lens (Concave-Concave)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 12 mm
- EFL
- -24 mm
- BFL
- -24.65 mm
- R1
- -25.14 mm
- R2
- 25.14 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
68-013 12mm Dia. x -24mm FL; NIR II Coated; Double-Concave Lens 750-1550nm
The 68-013 is a double-concave lens with a diameter of 12mm and a focal length of -24mm, making it a negatively powered lens. This lens is sourced from Edmund Optics, a reputable vendor known for its high-quality optical elements. The lens is designed for use in the near-infrared (NIR) spectrum, specifically between 750nm and 1550nm, making it suitable for various applications in this range.
The lens is made from N-BK7 Schott glass, a popular material for optical elements due to its excellent optical properties and versatility. The lens features a standard curve coating on both the front and back surfaces, specifically the EDM NIR-II std curve. This coating is designed to enhance the lens' performance in the NIR spectrum, improving transmission and reducing reflection.
The geometry of the lens is also noteworthy. The lens has an edge thickness of 3.31mm and a center thickness of 2mm. The front and back radii of curvature are -25.14mm and 25.14mm, respectively, indicating a strongly concave shape. The back focal length is -24.65mm, slightly shorter than the nominal focal length due to the thickness of the lens.