San Clemente, Calif. Reynard Corporation now offers complete customization of its Circular Variable Neutral Density (CVND) filters. These devices are used in high-quality optical systems to change the intensity of light from 100% to less than 0.1%.
The CVND filters are fully customizable in optical density gradient function, transmission gradient function, substrate type, and coating materials. Available in 1.0- to 8.0-inches in diameter, these filters are typically specified in linear optical density or transmission, said the company, however, since all optical systems are not linear in operation, the devices are customizable by density gradient based on user-defined functions. Gradient coatings can be supplied from 45° to 360° of rotation and are used for laser as well as wideband applications
The filters can be made on a variety of substrates including BK-7, Fused Silica, ZnSe, and Ge. The typical coating material is a nickel variant for room temperature, low-power
applications. The ND coating can be enhanced to increase survivability in hostile environments by the use of other common and precious metals to match the
absorption, spectral, and environmental characteristics of a customized system. Gradient coatings and substrates can be supplied to operate from the UV to Far IR.
In imaging systems, large aperture neutrality with constant density can be achieved by configuring two filters of equal design back-to-back, said the company, and counter-rotating the two filters allows for a variable setting of the density or transmission requirement in both the rotational and radial directions. Click the link for more information about the company's filters.
Reynard Corporation, 1-949-366-8866, www.reynardcorp.com