Semrock Inc. has extended its family of UV filters with an ion beam sputtered filter designed for 224.3-nm helium-silver hollow-cathode metal-ion lasers. It has a transition width of <1920 cm–1, a passband range of 235.0 to 505.9 nm and an average passband transmission >93%. The RazorEdge line of ultrasteep long-wave pass Raman spectroscopy filters now extends from 224 to 1064 nm. The filters are designed to be used with light at or near normal incidence. The company’s complementary MaxLine filters range from 248.6 to 1064 nm.