The R00580-xx from Reynard Corporation is a Circular Variable Neutral Density (CVND) Filter that allows transmission at a wavelength from ultraviolet to far infrared region. It has a calibrated wavelength of 510 nm and an optical density of 0 - 1, 2, 3, 4, or 5. This optical filter can be manufactured using BK7, fused silica, Ge, Si, ZnSe or other equivalent materials and has a scratch & dig surface quality of 80 - 50. It has a clear aperture of 80 %, gradient range of 270º, and an inside diameter of 7.5 mm - 25.4 mm.
The R00580-xx has a parallelism of up to 3 arc minutes and transmitted wavefront error of up to 2 waves per 25 mm. It has a continuous wave laser damage threshold of 75 W/cm2 and pulsed laser damage threshold of 10 mJ/cm2 with 10 ms pulses. This optical filter can change light intensity from 100 % to less than 0.1 % and their size can be varied from 25 mm to over 200 mm. It is ideal for attenuation of white light & laser sources, maintaining light intensity consistency & calibration, large aperture attenuation, and can be used as a variable beamsplitter.