67-812 25 mm Dia. Mounted Traditional Coated Bandpass Interference Filter; t=3.5 mm 270nm

The 67-812 is a Bandpass Filter with a circular base shape and a 25 mm mounted diameter, sourced from the reputable vendor Edmund Optics. This filter is designed to transmit light within a specific range of wavelengths while blocking other wavelengths, making it ideal for applications that require narrowband light transmission.

The filter's primary wavelength is 270nm, with a Full Width at Half Maximum (FWHM) of 10nm. The FWHM is a measure of the filter's bandwidth, indicating the range of wavelengths that the filter allows to pass. The cut-on wavelength is 265nm, and the cut-off wavelength is 275nm, further defining the filter's passband.

The filter is made from UVFS Mal-1965 material, a common choice for applications that require high transmission in the ultraviolet region. The filter has a thickness of 3.5mm, providing sufficient mechanical strength for most applications.

The 67-812 filter features front and back coatings of EDM 67-745, which are likely broadband antireflection coatings designed to minimize surface reflections and improve transmission. The filter's shape is a Thin Lens, suggesting that it may have some degree of optical power, although this is not explicitly stated in the provided data.

In terms of availability, the filter's weblink status is "Valid - in stock", indicating that it is readily available for purchase and delivery. This filter is a reliable choice for applications that require narrowband light transmission in the ultraviolet region.