64-679 12.5 mm Dia. Traditional Coated OD 2.0 Longpass Filter; t=1.5mm 975nm

The 64-679 is a Longpass Filter, a type of optical filter that transmits wavelengths longer than a specified value, while blocking shorter wavelengths. This particular model has a diameter of 12.5 mm and a thickness of 1.5 mm, making it suitable for a wide range of optical applications.

The filter is manufactured by Edmund Optics, a leading supplier of optical components, and is identified by the catalog number 64-679. It is made from UVFS Mal-1965, a material known for its optical properties. The filter's coating, denoted as EDM 64-679, is applied to both the front and back surfaces, enhancing its performance and durability.

The 64-679 filter is designed to cut on at 975 nm, meaning it begins to transmit light at this wavelength. It does not have a specified cut-off wavelength, indicating that it continues to transmit all longer wavelengths. This makes it ideal for applications where the detection of longer wavelengths is required.

The filter's geometry is shaped as a thin lens, which can be beneficial in certain optical systems. The 64-679 is currently in stock and available for purchase through the Edmund Optics website, as indicated by its weblink status.