NE20B Dia. 25 mm Absorptive ND Filter; Optical Density 2.0
- Type
- Filter
- Subtype
- Neutral Density Filter
- Brand
- Thorlabs
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.
