67-821 25 mm Dia. Mounted Traditional Coated Bandpass Interference Filter; t=6.9 mm 320nm

The 67-821 is a 25 mm diameter mounted bandpass interference filter, designed and manufactured by Edmund Optics. This filter is specifically engineered for applications that require precise wavelength selection within the ultraviolet spectrum.

The filter's primary wavelength (CWL) is 320nm, with a full width at half maximum (FWHM) of 10nm. This means it allows light transmission in a narrow band around the central wavelength, effectively blocking out unwanted spectral ranges. The cut-on wavelength is 315nm, and the cut-off wavelength is 325nm, further enhancing its selectivity.

The filter is constructed with a UVFS material (Mal-1965) and has a thickness of 6.9mm. It features traditional coating on both the front and back surfaces, identified as EDM 67-754. This coating enhances the filter's performance by reducing surface reflections and improving transmission efficiency.

The filter's geometry is in the form of a thin lens, making it suitable for various optical systems. The 25mm diameter provides a reasonable aperture size, balancing light gathering capability and spatial resolution.

According to the vendor's information, this filter is currently in stock and can be purchased directly from the Edmund Optics website using the provided weblink.