Andover Corporation Standard UV ND Filter, OD=0.2, 25mm diameter

Neutral density (ND) filters are useful in a number of applications such as attenuators for broadband spectral sources, partial reflectors for light balancing applications and for use as neutral beamsplitters. Metallic type neutral density filters obtain their optical density by depositing a metal alloy coating onto a specific type of substrate which is determined by the wavelength region of interest. TWF 1/4 wave. Parallelism < 5 arcsec. UV Grade Fused Silica substrates available in custom sizes *HIGH VOLUME* - This product lends itself to being produced in large quantities at competitive pricing. Email info@andcorp.com or fill out a contact form for details. Please note that all of our ND filters are also available in sets, which include a hardwood storage box. Custom sizes, densities, wavelengths and substrate materials are available on request. Contact us for a quotation, whether it is for prototype quantities, or production quantities. Show More Information Optical density (OD) is defined as the logarithm to the base 10 of the reciprocal of the transmitted radiant power (T): Please note that all of our ND filters are also available in sets, which include a hardwood storage box. Custom sizes, densities, wavelengths and substrate materials are available on request. Contact us for a quotation, whether it is for prototype quantities, or production quantities. METALLIC NEUTRAL DENSITY SPECIFICATIONS Transmission Deviation from Nominal (%)