Optical filters are used to select the desired spectrum of a light beam. This can be necessary for different conditions. Bandpass filters are frequently used to clean up the spectrum after a beam source or before a detector. Bandpass, short-pass, long-pass, band-stop, and notch filters or beam splitters are distinguished according to their design.
Powerful continuously tunable filters from Delta Optical Thin Film for spectroscopy, characterized by high transmission and high edge steepness.