84-746 25 mm Dia. Hard Coated High Performance OD 4.0 Longpass Filter; t=3 mm 625nm

The 84-746 is a high-performance longpass filter, boasting a 25 mm diameter and a thickness of 3 mm. This filter, sourced from Edmund Optics, is designed to transmit light at wavelengths longer than 625 nm, making it ideal for applications that require the separation of infrared light from visible light.

The filter features a circular base shape and is constructed from UVFS Mal-1965 material, a common choice for optical components due to its excellent transmission properties and durability. The 84-746 is cut on at 625 nm, meaning it begins to transmit light at this wavelength, and has a cut off of 0, indicating it transmits all wavelengths longer than 625 nm.

The 84-746 is coated on both the front and back surfaces with EDM 84-740, a hard coating that enhances the filter's durability and resistance to scratches and other forms of damage. This coating also helps to reduce reflection, improving the filter's overall efficiency.

The filter's geometry, with a diameter of 25 mm and a thickness of 3 mm, is designed to fit standard optical systems. Its thin lens shape ensures minimal distortion and maintains the integrity of the light path.