Interference Filters

Edmund Optics introduces narrow laser line interference filters and broadband diode interference filters. The interference filters feature a bandwidth of just 1 nm – the narrowest bandwidth available in the industry. The filters are an excellent choice for systems that require an extremely narrow bandpass. They are typically used to enhance the signal-to-noise ratio of laser-based analytical instrumentation. Primarily utilized with gas and DPSS lasers, narrow band (1 nm) filters are used in the sensor path to eliminate all ambient light (noise) and allow the sensor to detect the laser wavelength. Using a narrowband interference filter, a system may not require dispersion elements such as prisms or gratings, allowing a lower cost than other alternatives. The filters provide transmissions of greater than 50% and OD greater than four from 200–1,150 nm wavelength.