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49-361 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=125mm VIS-NIR 400-1000nm

49-361 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=125mm VIS-NIR 400-1000nm

Type
Lens
Subtype
Multiplets
Brand
Edmund Optics
Product webpage
Edmund Optics products in the 3DOptix catalog

Properties

Shape
Circular
Diameter
25 mm
EFL
125 mm
R1
76.28 mm
R2
-54.55 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-SF5
Dispersion Equation
Sellmeier
n (λ)
1.6771143911586193
λ
550 nm
B1
1.52481889
C1
0.011254756 μm2
B2
0.187085527
C2
0.0588995392 μm2
B3
1.42729015
C3
129.141675 μm2

49-361 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=125mm VIS-NIR 400-1000nm

The 49-361 is a high-quality achromatic doublet lens, designed and manufactured by Edmund Optics. This lens is specifically engineered for use in the visible (VIS) and near-infrared (NIR) spectrum, with a wavelength range of 400-1000nm. The lens boasts a 25mm diameter and an effective focal length (EFL) of 125mm, making it suitable for a wide range of optical applications.

The lens is constructed from two types of glass: N-BK7 and N-SF5, both from Schott. These materials are chosen for their excellent optical properties, including low dispersion and high transmission in the specified wavelength range. The lens features a complex geometry, with three radii of curvature (r1, r2, and r3) and varying thicknesses at the edge, center, and center-a. This design helps to correct chromatic aberration, a common issue in optical systems, ensuring sharp and clear images.

The 49-361 lens is coated with Edmund Optics' proprietary VIS-NIR coating (edm visnir0sp2002000), which is applied to both the front and back surfaces. This coating is designed to enhance the lens's performance in the VIS-NIR spectrum, reducing reflection and increasing transmission.

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