NE13B Dia. 25 mm Absorptive ND Filter; Optical Density 1.3

The NE13B is a Neutral Density (ND) Filter, measuring 25 mm in diameter and 2.5 mm in thickness, manufactured by Thorlabs. This filter is designed to reduce the intensity of incident light without altering its color composition, making it an ideal tool for applications involving high-intensity light sources.

The NE13B filter features a coating of NE13A on both the front and back surfaces, which is Thorlabs' proprietary absorptive coating. This coating is specifically designed to provide a high level of neutrality, ensuring that the filter does not introduce any color casts or distortions to the light passing through it.

The filter is constructed from N-BK7 Schott glass, a high-quality optical material known for its excellent transmittance, homogeneity, and resistance to thermal shock. This glass is cut into a circular shape, following a thin lens geometry, which contributes to its ease of integration into various optical systems.

The NE13B filter is currently in stock and available for purchase through Thorlabs' official website. For more information, including technical specifications and pricing, please refer to the provided weblink.