47-319 50 mm Dia. N-LAK22/N-SF6 Achromatic Doublet; EFL=200mm NIR II 750-1550nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 50 mm
- EFL
- 200 mm
- R1
- 114.74 mm
- R2
- -114.74 mm
Material 1
- Name
- N-LAK22
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.6536179449828925
- λ
- 550 nm
- B1
- 1.14229781
- C1
- 0.00585778594 μm2
- B2
- 0.535138441
- C2
- 0.0198546147 μm2
- B3
- 1.04088385
- C3
- 100.834017 μm2
Material 2
- Name
- N-SF6
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.811866267147773
- λ
- 550 nm
- B1
- 1.77931763
- C1
- 0.0133714182 μm2
- B2
- 0.338149866
- C2
- 0.0617533621 μm2
- B3
- 2.08734474
- C3
- 174.01759 μm2
47-319 50 mm Dia. N-LAK22/N-SF6 Achromatic Doublet; EFL=200mm NIR II 750-1550nm
The 47-319 is a high-quality achromatic doublet lens, boasting a 50 mm diameter and an effective focal length of 200 mm, specifically designed for use in the near-infrared spectrum (NIR II) range of 750-1550 nm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for purchase directly from their website.
The lens is constructed from two types of Schott glass, N-LAK22 and N-SF6, which are carefully selected and arranged to minimize chromatic aberration, a common issue in optical systems. The geometry of the lens is meticulously designed, with a thickness of 11.49 mm at the edge, a central thickness of 9 mm, and a central thickness 'a' of 5.5 mm. The lens also features inner and outer radii of 0 mm, and radii 'r1' and 'r2' of 114.74 mm and -114.74 mm respectively, and 'r3' of -1258.4 mm.
The lens is coated with Edmund Optics' standard NIR-II coating on both the front and back surfaces, ensuring optimal performance in the NIR II spectrum. This coating is designed to enhance transmission and reduce reflection, thereby improving the overall efficiency and quality of the optical system.
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