Optical Filters are generally classified in accordance with spectral bands film materials, spectral properties and features for application.

1. Spectral band

Ultraviolet filters visible filters Infrared filters, visible filters.

2.Membrane Material

Filters made of soft film are mostly utilized to analyze biochemical compounds.

Hard film filters are commonly utilized in laser systems.

3.Spectral Characteristics

Cutoff filters and bandpass filters neutral density filters reflective filters.

4.Band Pass Type

The light from the chosen band is passed through, while the light that is not in the passband is blocked. Its optical indicators are predominantly the center wavelength and half-bandwidth which is divided into broadband and narrowband.

5 .Short-wave passing type (low-wave pass)

shorter than the wavelength of light that passes through it, and longer in comparison to the wavelength at cutoff for light, like infrared transmission filters.

In essence the filter classification has a variety of uses The specific kind of filtering should be adapted in accordance with the current scenario.

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