The NDUV501A is a Neutral Density Filter from Thorlabs, designed with a circular shape and a diameter of 12.7 mm. This filter is made from UVFS material, identified by the catalog number mal-1965. It has a thickness of 1 mm and is coated with tho nduv od01 on both the front and back surfaces.
The NDUV501A is designed to operate at a wavelength of 300 nm and features a thin lens shape. The filter is part of Thorlabs' extensive catalog, which includes a wide variety of optical elements from different vendors worldwide. The weblink provided leads to the product's page on Thorlabs' official website, where users can find more information and check the product's availability.