86-657 25 mm Dia. Hard Coated OD 4.0 25nm Bandpass Filter; t=3.5 mm 650nm

The 86-657 is a Bandpass Filter, specifically designed for applications requiring a narrow passband. This filter, sourced from Edmund Optics, features a circular shape with a diameter of 25 mm and a thickness of 3.5 mm. The filter's primary function is to transmit light within a specific range of wavelengths while blocking other wavelengths.

The 86-657 filter is designed to transmit light at a central wavelength (CWL) of 650 nm, with a full width at half maximum (FWHM) of 25 nm. This means it allows light between 637.5 nm and 662.5 nm to pass through while blocking other wavelengths. This characteristic makes it ideal for applications that require a high level of wavelength specificity, such as fluorescence microscopy or laser spectroscopy.

The filter's front and back surfaces are coated with EDM 86-645, a hard coating that enhances its durability and resistance to environmental factors. This coating also reduces the risk of surface damage during handling and installation.

The 86-657 filter is available for purchase from the Edmund Optics website, where it is listed as being in stock. The product's webpage provides additional information and specifications, as well as options for customization and bulk ordering.