NE01A Dia. 25 mm Absorptive ND Filter; SM1-Threaded Mount; Optical Density 0.1

The NE01A is a Neutral Density (ND) Filter, offered by Thorlabs, with a diameter of 25 mm and a thickness of 0.6 mm. This filter is designed to reduce the intensity of incident light without altering its color composition, making it an ideal tool for managing light intensity in various optical applications.

The filter features an SM1-threaded mount, providing compatibility with a wide range of optical systems and components. The SM1 thread is a standard thread size in the optical industry, offering versatility in system integration.

The NE01A filter is made of n-BK7 Schott, a high-quality optical glass known for its excellent transmittance and low auto-fluorescence. This material ensures high-fidelity light transmission and minimal optical distortion.

The filter's coating is another notable feature. Both the front and back surfaces are coated with the THo NE01A coating, which provides the filter with its neutral density properties. This coating is designed to maintain consistent attenuation across the visible spectrum, ensuring color neutrality.

The filter's shape is described as a 'Thin Lens', indicating that it has been designed to minimize optical aberrations and distortions. This shape, combined with the high-quality glass and precise coating, ensures that the NE01A filter delivers reliable and accurate light reduction.