89-659 12.5 mm Dia. Hard Coated High Performance OD 4.0 Longpass Filter; t=3 mm 1250nm

The 89-659 is a high-performance longpass filter, designed and manufactured by Edmund Optics. This filter is part of their extensive catalog, which includes a wide variety of optical elements sourced from vendors worldwide. The 89-659 filter is specifically designed for use in applications where precise wavelength control is required.

The filter is circular in shape, with a diameter of 12.5 mm and a thickness of 3 mm. It is made from UVFS Mal-1965, a material specifically chosen for its optical properties. The filter is hard coated, which enhances its durability and resistance to wear and tear, making it ideal for use in demanding environments.

The 89-659 filter is a longpass filter, which means it allows light with wavelengths longer than a certain value to pass through while blocking lighter wavelengths. In this case, the cut-on wavelength is 1250 nm, meaning it allows all wavelengths longer than 1250 nm to pass through. The cut-off wavelength is 0 nm, meaning it blocks all wavelengths shorter than 0 nm.

The filter features the same coating on both the front and back, specifically EDM 89-659. This coating is designed to enhance the filter's performance and durability. The filter is designed to fit a Thin Lens shape.

The 89-659 filter is currently in stock and available for purchase. More information about this filter, including detailed specifications and purchasing options, can be found on the Edmund Optics website at https://www.edmundoptics.com/p/1250nm-125mm-dia-high-performance-longpass-filter/32118/.