NE80B Dia. 25 mm Absorptive ND Filter; Optical Density 8.0

The NE80B is a Neutral Density (ND) Filter, measuring 25 mm in diameter and 1.9 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 essential tool in various optical applications.

The NE80B features a neutral density of 8.0, which signifies a reduction of 10^8 times the input light intensity. This high attenuation level is particularly useful in high-intensity light scenarios, such as laser applications, where it is crucial to protect sensitive optical components or detectors from potential damage.

The filter's coating, identified as 'tho ne80a' on both the front and back surfaces, ensures consistent attenuation across the entire spectral range. This coating is applied to a base of n-BK7 Schott glass, a material known for its excellent optical properties, including high homogeneity, low auto-fluorescence, and superior transmittance.

The NE80B's thin lens shape allows for easy integration into various optical systems. Furthermore, its circular geometry provides versatility in mounting and alignment, ensuring seamless compatibility with most optical setups.