NDW04B Dia. 25 mm Reflective ND Filter; Optical Density 0.4
- 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
NDW04B Dia. 25 mm Reflective ND Filter; Optical Density 0.4
The NDW04B 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 essential tool for various optical applications.
The filter features a front and back coating of 'tho ndw04b', which is Thorlabs' specific coating for this type of filter. This coating ensures high transmission and low reflection, enhancing the filter's performance and reliability.
The NDW04B has an optical density of 0.4, which corresponds to a reduction factor of approximately 2.512 in light intensity. This makes it suitable for applications where moderate light reduction is required.
The filter is made of N-BK7 Schott, a high-quality borosilicate glass known for its excellent optical properties. The filter's geometry, including a diameter of 25 mm and a thickness of 1 mm, is designed for compatibility with a wide range of optical systems.
The NDW04B is currently in stock and available for purchase through Thorlabs' official website. For more information, you can refer to the provided weblink.