The high-performance narrow-band and wide-band ultraviolet band-pass filters produced by HB Optical have a spectral coverage of 200nm to 380nm. The UV bandpass filter is manufactured by ion beam assisted deposition (IAD) and plasma assisted deposition (PIAD). The filter layer is a high-density hard film, which ensures a long service life.   The filter we provide has a very high cut-off background depth, which can greatly improve the signal-to-noise ratio of the system.   Most filters are packaged in a black anodized aluminum housing with a logo printed on it, and the arrow marks represent the direction of light transmission inside the filter.