AC254-250-B 25.4 mm Dia. SF5/N-SF6HT Unmounted Achromatic Doublet; EFL=250mm 650-1050nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Thorlabs
Properties
- Shape
- Circular
- Diameter
- 25.4 mm
- R1
- 52 mm
- R2
- -65.31 mm
Material 1
- Name
- SF5
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.6771178435097918
- λ
- 550 nm
- B1
- 1.46141885
- C1
- 0.0111826126 μm2
- B2
- 0.247713019
- C2
- 0.0508594669 μm2
- B3
- 0.949995832
- C3
- 112.041888 μm2
Material 2
- Name
- N-SF6HT
- 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
AC254-250-B 25.4 mm Dia. SF5/N-SF6HT Unmounted Achromatic Doublet; EFL=250mm 650-1050nm
The AC254-250-B is a high-quality unmounted achromatic doublet lens, designed and manufactured by Thorlabs. This lens is specifically engineered for use in the 650-1050nm spectral range, making it ideal for a wide range of applications in the near-infrared region.
The lens features a diameter of 25.4mm, providing a good balance between compactness and light-gathering capability. The edge thickness of the lens is 4.7mm, ensuring robustness and durability. The lens is constructed from SF5 and N-SF6HT Schott glass, known for their excellent optical properties and resistance to environmental factors.
The lens's geometry is characterized by its three radii of curvature (r1, r2, and r3), which are 52mm, -65.31mm, and 111.51mm respectively. These radii, combined with the lens's thickness at the center (4mm and 1.5mm), contribute to the lens's excellent imaging performance.
The lens is coated with Thorlabs' proprietary AC650-1050-B coating on both the front and back surfaces. This coating is specifically designed to enhance the lens's performance in the 650-1050nm spectral range, providing improved transmission, reduced reflectance, and increased durability.
