Neutral Density optical filters
Custom broad-band neutral density filter designs are available for any transmission value or wavelength region. These filters are available for deposition onto a wide variety of substrates.

• Typical Neutral Density filter designs:
(please click on graphs to see larger version)

Contact our design team to discuss your specifications!

Neutral Density (ND) filters are designed to reduce the intensity of light by absorbing or reflecting a portion of it. The filter has a constant attenuation across a range of specified wavelengths. ND filters are typically expressed in terms of their OD (optical density) - the measure of transmittance through a medium. The OD is defined as -log10(T), where T = transmission.