Circular Variable Neutral Density (CVND) Filters
San Clemente, CA - Reynard Corporation, a leading global supplier of custom optics and thin film coatings announces complete customization of their Circular Variable Neutral Density (CVND) Filters. This technology is best used in high quality optical systems to change the intensity of light from 100% to less than 0.1%. As the filter rotates the beam intensity is modified due to the density variation of a gradient metallic coating around the filter. Used from UV to IR, density neutrality can be achieved for narrow band applications, such as lasers, to wide band applications, such as the spectrum of white light. These filters are fully customizable in optical density gradient function, transmission gradient function, substrate type, coating materials, and size to match your application requirements.
These filters are typically specified in linear optical density or transmission. But, since all optical systems are not linear in operation, Reynard Corporation offers the capability of customizing the density gradient based on user defined functions. The filters can be made on a variety of substrates including BK-7, Fused Silica, ZnSe, and Ge, among several others. The typical coating material is a nickel variant for room temperature, low-power applications. But the ND coating can be enhanced to increase survivability in hostile environments using other common and precious metals to match the absorption, spectral, and environmental characteristics of a customized system.
Key Features:
• Better Performance: CVND filters change light intensity from 100% to less than 0.1%.
• Custom Wavelengths: Gradient coatings and substrates can operate from the UV to far IR.
• Density Range Options: CVND gradients available from (specify) 0 – 1, 2, 3, 4 or 5.
• Substrate Materials: NBK-7, Fused Silica, Ge, Si, ZnSe & others.
• Wide Aperture: Two CVND filters positioned back-to-back produce a large aperture of fixed density.
• Dimensions: CVND’s are available from 25mm to over 200mm in diameter.
• Gradient Range: coatings can be supplied from 45° to 360°of rotation.
Applications:
• Attenuation of white light and laser sources
• Maintain light intensity consistency and calibration
• Large aperture attenuation
• Gradient coatings are used for Laser as well as Wide Band applications.
• Can be used as a variable beamsplitter
In imaging systems, large aperture neutrality with constant density can be achieved by configuring two filters of equal design back-to-back. Counter-rotating the two filters allows for a variable setting of the density or transmission requirement in both the rotational and radial directions. "For large aperture imaging, the two-filter solution offers adjustment flexibility that cannot be physically achieved by any other means," says Randy Reynard, President of Reynard Corporation, "High-resolution cameras can operate with full aperture while still being able to attenuate light."
About Reynard Corporation
Reynard Corporation manufactures custom optics and thin-film coatings 0.2µm to 50µm (UV-IR) to demanding specs for defense & aerospace, commercial & industrial and medical applications. Our expertise in these markets enables us to provide advanced optical solutions while building strong reliable relationships with our customers. Other in-house capabilities include optical fabrication, diamond turning, photolithographic patterning & environmental testing. Prototype to production, ISO 9001:2015 Certified, ITAR Registered and Cybersecurity Compliant. We look forward to working with you in Perfecting Your Light™ Visit our website for additional information at www.reynardcorp.com
