Semrock Inc. has unveiled a series of optical thin-film single- and multinotch filters for use with standard laser lines and for OEM applications. The standard single-notch filters are designed for Raman spectroscopy, fluorescence and analytical instrumentation. The multinotch filters are available on an OEM basis, for confocal microscopy and fluorescence scanners. All are made with hard-coating technology and without adhesives in the optical path. The 532-nm filters have a notch width of 20 nm -- 4% of the wavelength -- and greater than 90% transmission outside the notch. The company says that its software tools and its stable ion-beam sputtering and proprietary deposition control technology ensure high performance.