325 nm Narrowband UV Bandpass Filter

325 nm Narrowband UV Bandpass Filter325 nm narrow-bandpass interference filter isolates a precise UVA spectral window, thereby enhancing signal-to-noise ratio (SNR) and spectral selectivity in applications such as UV spectroscopy, laser line purification, and instrument calibration.Standard bandpass filter families are available in both 25.4 mm round and 50.8 mm square formats, facilitating seamless integration into existing optical systems. Hard-coated single-substrate designs further improve mechanical and environmental durability. Additionally, 50 mm diameter 325 nm filters are available to accommodate larger aperture requirements.These filters are based on multi-cavity Fabry–Pérot thin-film architectures, which provide steep spectral edges and strong out-of-band attenuation (typically optical density ≥ 4 for hard-coated UV/VIS series).At 325 nm, the filter operates within the UVA spectral range (315–400 nm), a classification widely recognized by international health and safety age…