The FB3250-500 is a high-quality bandpass filter, designed and manufactured by Thorlabs. This particular model is a circular filter, made from sapphire ow mal-1972, and features a diameter of 1 inch and a thickness of 3 millimeters.
The filter is designed to pass wavelengths in the infrared (IR) region of the spectrum, specifically between 3000 and 3500 nanometers, with a central wavelength (CWL) of 3250 nanometers. The full width at half maximum (FWHM) of this filter is 500 nanometers, indicating a relatively broad passband.
The front and back surfaces of the filter are coated with Thorlabs' proprietary coating, designated as 'tho fb3250-500'. This coating enhances the filter's performance and durability.
The filter is available for purchase directly from Thorlabs' website, where it is currently listed as 'in stock'. The product's webpage provides additional technical details and specifications, as well as options for customization and additional accessories.