FND-15C02-80 15 mm Dia. Unmounted N-BK7 Visible Reflective Neutral Density Filter; t=2mm 400-700nm

OptoSigma's FND-15C02-80 is a high-quality Neutral Density Filter, designed for use in the visible spectrum with a wavelength of 550nm. This unmounted filter boasts a circular geometry, with a diameter of 15mm and a thickness of 2mm, making it a versatile choice for a variety of optical applications.

The filter is made from N-BK7, a type of borosilicate glass manufactured by Schott AG, which is known for its excellent optical properties and durability. This material is particularly suitable for applications that require high homogeneity and low auto-fluorescence.

The FND-15C02-80 is coated with OptoSigma's proprietary FND-80 coating on both the front and back surfaces. This coating is designed to provide high reflectivity in the visible spectrum, making it ideal for use in applications such as beam splitting or laser mirrors.

The filter's thin lens shape allows for easy integration into existing optical systems, while its unmounted design provides flexibility in terms of mounting and alignment. According to the vendor, the filter is currently in stock and available for immediate purchase.