NE40B-A Dia. 25 mm AR-Coated Neutral Density Filter; 350-700nm; OD 4.0 AR 350-700nm

The NE40B-A 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 ideal for applications involving high-intensity light sources.

The filter boasts a wavelength of 633 nm and is constructed with a Thin Lens shape, ensuring minimal distortion and high optical quality. It features AR coatings on both the front and back surfaces, specifically designed for the 350-700 nm range. These coatings help to minimize reflection and enhance transmission, further improving the filter's performance.

The NE40B-A has a thickness of 2.8 mm, providing robustness and durability. It is available from Thorlabs' website, and the current status indicates that it is in stock, ensuring prompt delivery for your optical projects.