Notch Interference Filters

Notch filters are notch filters, also known as interference filters, optical films used for spectral or color segmentation. According to the shape of the divided spectrum, it is divided into band-pass filter, cut-off filter, Notch filter, and special filter. Generally, it is called a band-stop or band-suppression filter, which refers to a filter that has a concave spectral characteristic through the light of a given wavelength, as far as possible, through as many other wavelengths as possible. It is a relatively cut-off filter, which is mainly used to eliminate or reduce specific light and enhance other spectral energy. The cut-off depth and the flatness of transmission area are the key measurement parameters of the index. Notch filters can mainly transmit most wavelengths, but attenuate light in a specific wavelength range (stop band) to an incredibly low level, which is opposite to the use method and spectral curve of bandpass filters.