63-409 25 mm Dia. Non-Reflective Neutral Density Filter; OD 0.9 NIR 700-1200nm

The 63-409 is a Neutral Density Filter with a 25 mm diameter, designed for use in optical systems that require precise control over light intensity. Manufactured by Edmund Optics, this filter features a non-reflective coating, making it ideal for applications where minimal reflection is crucial.

The filter's primary function is to reduce the intensity of incident light without altering its color composition. This is achieved through a 0.9 Optical Density (OD), which corresponds to a reduction of approximately 75% in light intensity. The filter is designed to operate within the Near-Infrared (NIR) spectrum, specifically between 700 and 1200 nanometers, making it suitable for applications that utilize NIR light.

The filter is constructed from UVFS Mal-1965, a material known for its optical properties and durability. It has a thickness of 1.5 mm, which contributes to its overall robustness and ability to withstand typical handling and operational stresses. The filter's thin lens shape further enhances its functionality and compatibility with various optical systems.

The front and back surfaces of the filter are coated with EDm 63-399, a coating that enhances the filter's performance by reducing surface reflections. This non-reflective coating ensures that the filter performs optimally within its specified wavelength range, minimizing losses due to reflection and scattering.