NE04B Dia. 25 mm Absorptive ND Filter; Optical Density 0.4

The NE04B is a Neutral Density (ND) Filter, measuring 25 mm in diameter and 0.7 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 filter's primary function is achieved through its absorptive coating, specifically the tho ne04a coating on both the front and back surfaces. This coating is responsible for the filter's optical density of 0.4, which translates to a reduction of approximately 25% of the incident light's intensity. This makes the NE04B ideal for managing light intensity in high-powered laser systems or other bright light sources.

The NE04B is crafted from N-BK7 Schott, a high-quality borosilicate glass known for its excellent optical properties. This material ensures minimal distortion and maintains the integrity of the light passing through the filter. The circular shape of the filter is designed to fit into standard filter holders or mounts, providing versatility in its application.