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NE20B Dia. 25 mm Absorptive ND Filter; Optical Density 2.0

NE20B Dia. 25 mm Absorptive ND Filter; Optical Density 2.0

Type
Filter
Subtype
Neutral Density Filter
Brand
Thorlabs
Product webpage
Thorlabs products in the 3DOptix catalog

Properties

Shape
Circular
Diameter
25 mm

Material

Name
N-BK7
Dispersion Equation
Sellmeier
n (λ)
1.5150823520020043
λ
633 nm
B1
1.03961212
C1
0.00600069867 μm2
B2
0.231792344
C2
0.0200179144 μm2
B3
1.01046945
C3
103.560653 μm2

NE20B Dia. 25 mm Absorptive ND Filter; Optical Density 2.0

The NE20B is a Neutral Density Filter with a diameter of 25 mm, manufactured by Thorlabs. This filter is designed to reduce the intensity of incident light without altering its color composition, making it an ideal tool for various optical applications.

The filter's primary function is achieved through its absorptive coating, denoted as 'tho ne20a' on both the front and back surfaces. This coating is responsible for the filter's optical density of 2.0, which signifies a significant 100 times reduction in light intensity.

The NE20B filter is crafted from N-BK7 Schott, a high-quality borosilicate glass known for its excellent optical properties. The filter's geometry, including its 1.4 mm thickness, is shaped in a thin lens form, contributing to its compact design and ease of integration into optical systems.

The filter's specifications are validated by Thorlabs, indicating its availability and readiness for use. Further information and purchasing options can be found on the vendor's official website, linked in the item data.

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