NE40A Dia. 25 mm Absorptive ND Filter; SM1-Threaded Mount; Optical Density 4.0
- 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
NE40A Dia. 25 mm Absorptive ND Filter; SM1-Threaded Mount; Optical Density 4.0
The NE40A is a Neutral Density Filter by Thorlabs, designed with a circular shape and a diameter of 25 mm. This filter is made of n-bk7 schott material, ensuring high-quality performance. It has a thickness of 2.8 mm, making it a thin lens type. The filter features an SM1-threaded mount, providing a secure and easy-to-use mechanism for mounting it onto other optical components.
The NE40A filter boasts a coating on both the front and back, specifically the tho ne40a coating. This coating enhances the filter's functionality and durability. The filter is designed to work optimally with a wavelength of 633 nm.
The optical density of the NE40A is 4.0, indicating its ability to reduce light intensity. This makes it an ideal choice for applications where light control is crucial. The filter is currently in stock and can be purchased directly from Thorlabs via the provided weblink.
