The classification of optical filters

Filter products are mainly classified by spectral band, spectral characteristics, film material, application characteristics and so on.

Spectral band: UV filter, visible filter, infrared filter;

Spectral characteristics: band pass filter, cut-off filter, spectroscopic filter, neutral density filter, reflection filter;

Film material: soft film filter, hard film filter;

Hard film filter not only refers to the film hardness, but more importantly, its laser damage threshold, so it is widely used in laser systems, and facial soft film filters are mainly used in biochemical analyzers.

Band-pass type: The selected band of light through, the light outside the passband cut-off. Its optical index is mainly center wavelength (CWL), half bandwidth (FWHM). It is divided into narrowband and broadband.

Short-wave pass type (also called low-wave pass) : the light passing shorter than the selected wavelength, and the light cutoff longer than the wavelength. Such as infrared cut-off filters.

Long wave pass type (also called high wave pass) : light passing longer than the selected wavelength, light cutoff shorter than the wavelength, such as infrared filter light.

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