AC254-125-B-ML 25.4 mm Dia. N-BK7/N-SF8 Mounted Achromatic Doublet; EFL=125mm 650-1050nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Thorlabs
Properties
- Shape
- Circular
- Diameter
- 25.4 mm
- R1
- 44.5 mm
- R2
- -55.3 mm
Material 1
- Name
- N-BK7
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5185223876207927
- λ
- 550 nm
- B1
- 1.03961212
- C1
- 0.00600069867 μm2
- B2
- 0.231792344
- C2
- 0.0200179144 μm2
- B3
- 1.01046945
- C3
- 103.560653 μm2
Material 2
- Name
- N-SF8
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.6935844234114055
- λ
- 550 nm
- B1
- 1.55075812
- C1
- 0.0114338344 μm2
- B2
- 0.209816918
- C2
- 0.0582725652 μm2
- B3
- 1.46205491
- C3
- 133.24165 μm2
AC254-125-B-ML 25.4 mm Dia. N-BK7/N-SF8 Mounted Achromatic Doublet; EFL=125mm 650-1050nm
This is the AC254-125-B-ML, a 25.4 mm diameter achromatic doublet lens from Thorlabs. This lens is designed for use in the 650-1050nm spectral range, making it suitable for a wide range of applications in the near-infrared region.
The lens is a mounted doublet, meaning it comes with a mount for easy integration into optical systems. The mount is not specified in the item data, but Thorlabs offers a variety of mounting options that are compatible with their lenses.
The lens is made from two types of glass: N-BK7 and N-SF8, both from Schott. These glasses are chosen for their excellent optical properties and low dispersion, which helps to minimize chromatic aberration in the lens. The lens is coated with Thorlabs' AC650-1050-B coating on both the front and back surfaces, which is designed to enhance transmission in the 650-1050nm range.
The lens geometry is quite complex, with three radii of curvature (r1, r2, and r3) and two centers of thickness (thickness center 1 and thickness center 2). The edge thickness is 10mm, and the inner and outer radii are both zero, indicating that the lens is a simple doublet with no additional shaping. The central thicknesses are both 6mm, suggesting that the lens is quite thin relative to its diameter.
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