what kinds of filters can be divided into?

According to the spectral characteristics of filters, filters can be divided into six categories:

Bandpass filter, cut-off filter, spectroscopic filter, neutral density filter, reflection filter and negative filter (notch filter);

Bandpass type: the light of the selected band passes through and the light outside the passband is cut off. Its optical indexes are mainly center wavelength (CWL) and half bandwidth (FWHM). It is divided into narrowband and broadband. For example, narrow band filter, nbf-808.

Short wave pass type (also known as low wave pass): light shorter than the selected wavelength passes through, and light longer than the wavelength is cut off. For example, infrared cut-off filter, ibg-650.

Long wave pass type (also known as high wave pass): light longer than the selected wavelength passes through, and light shorter than the wavelength is cut off, such as infrared transmission filter, ipg-800.


Hanzhong Brisun Optics Co., Ltd. Is the high precision optical element manufacturer provides customized production of Various optical lenses, including spherical lens, cylindrical lens, optical window, mirror, prism, filter, metal base mirror and other high-precision optical elements. The base materials include various optical glass, fused quartz, calcium fluoride (CaF2), zinc selenide (ZnSe), germanium (GE), silicon (SI), sapphire, metal and other materials. And provide antireflective film, high reflection film, spectroscopic film, metal film and other optical coatings.

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