68-016 25mm Dia. x -50mm 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
- -50 mm
- BFL
- -50.82 mm
- R1
- -52.1 mm
- R2
- 52.1 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
68-016 25mm Dia. x -50mm FL; NIR II Coated; Double-Concave Lens 750-1550nm
The 68-016 is a double-concave lens with a diameter of 25mm and a focal length of -50mm, making it a negatively powered lens. This lens is sourced from Edmund Optics, a reputable vendor known for its high-quality optical components. 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 common material in optical systems due to its excellent optical properties and high Abbe number. This ensures low dispersion and high optical quality. The lens features a standard curve coating on both the front and back surfaces, specifically the EDM NIR-II coating. This coating is designed to enhance the lens' performance in the NIR spectrum, reducing reflection and increasing transmission.
The lens' geometry includes an edge thickness of 5.4mm and a center thickness of 2.5mm. The front and back radii are -52.1mm and 52.1mm, respectively, contributing to the lens' double-concave shape. The back focal length is -50.82mm, slightly shorter than the nominal focal length due to the lens' concave shape.
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