The 67-809 is a 25 mm diameter mounted bandpass interference filter, designed and manufactured by Edmund Optics. This filter is specifically engineered for use at a center wavelength of 254 nm, with a full width at half maximum (FWHM) of 40 nm. The filter is mounted, providing a convenient and secure method of integration into optical systems.
The filter's geometry includes a diameter of 25 mm and a thickness of 3.5 mm, making it suitable for a wide range of applications. The cut-on wavelength is 249 nm, and the cut-off wavelength is 259 nm, providing a narrow band of transmission. The coating on both the front and back of the filter is EDM 67-742, which is a traditional coating designed to enhance the filter's performance.
The filter's shape is that of a thin lens, which can be beneficial in certain optical system designs. The catalog number for this filter is 67-809, and it is currently in stock, according to the vendor's website. The filter is available for purchase directly from the vendor, with a link provided in the item data for convenience.