AC127-075-AB-ML 12.7 mm Dia. N-BK7/N-SF2 Mounted Achromatic Doublet; EFL=75mm 400-1100nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Thorlabs
Properties
- Shape
- Circular
- Diameter
- 12.7 mm
- R1
- 38.4 mm
- R2
- -35 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-SF2
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.6517389452840492
- λ
- 550 nm
- B1
- 1.47343127
- C1
- 0.0109019098 μm2
- B2
- 0.163681849
- C2
- 0.0585683687 μm2
- B3
- 1.36920899
- C3
- 127.404933 μm2
AC127-075-AB-ML 12.7 mm Dia. N-BK7/N-SF2 Mounted Achromatic Doublet; EFL=75mm 400-1100nm
The AC127-075-AB-ML is a mounted achromatic doublet lens, available from Thorlabs, designed for use within the 400-1100nm wavelength range. This lens boasts a 12.7 mm diameter and an effective focal length (EFL) of 75mm, making it suitable for a wide range of optical applications.
The lens is constructed from two types of glass: N-BK7 and N-SF2, both from Schott. The N-BK7, used for the first element, is a borosilicate crown glass with a low refractive index and low dispersion, making it an excellent choice for optical elements. The second element, made of N-SF2, is a dense flint glass with a high refractive index and high dispersion, which aids in the correction of chromatic aberrations.
The lens features anti-reflection (AR) coatings on both the front and back surfaces, specifically Thorlabs' AB Achromatic AR coating. This coating is designed to minimize surface reflections and improve transmission across the specified wavelength range.
The geometry of the lens is also noteworthy. It has a thickness of 3.3mm at the edge, with the first and second surfaces featuring radii of curvature of 38.4mm and -35mm, respectively. The center thickness of the first and second elements is 2.5mm and 1.5mm, respectively.
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