NE40B Dia. 25 mm Absorptive ND Filter; Optical Density 4.0

The NE40B is a Neutral Density (ND) Filter, measuring 25 mm in diameter and 2.8 mm in thickness, sourced from the renowned optical component manufacturer, 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 NE40B filter features a coating of tho ne40a on both the front and back surfaces. This coating is responsible for the filter's optical density of 4.0, which signifies a significant reduction in light intensity. Specifically, it allows only 0.01% of the incident light to pass through, equivalent to a reduction of 100,000 times. This makes the NE40B particularly suitable for high-intensity light sources or situations requiring extreme light attenuation.

The filter is designed in a Thin Lens shape, which is a departure from the traditional flat design of most filters. This shape allows for easier integration into optical systems that require lens-like components. The base material of the filter is n-bk7 schott, a high-quality borosilicate glass known for its excellent optical properties and durability.

The NE40B filter is currently in stock and available for immediate purchase through the Thorlabs website. For more information, including technical specifications and pricing, please refer to the provided weblink.