How are filters classified?

Optical Filter products are mainly classified according to spectral band, spectral characteristics, film materials, application characteristics, etc.

Spectral band: ultraviolet filter, visible filter, infrared filter

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

Film material: soft film filter, hard film filter

Hard film filter: not only refers to film hardness, but also its laser damage threshold, so it is widely used in laser systems; Soft film filter is mainly used in biochemical analyzer.

Bandpass type: the light of the selected wave band passes through, and the light outside the passband is cut off. Its optical indicators are mainly the central wavelength (CWL) and half bandwidth (FWHM), which are divided into narrowband and broadband. For example, narrowband filter short wave pass type (also called low wave pass): the light shorter than the selected wavelength passes through, and the light longer than the wavelength is cut off, such as infrared cut-off filter long wave pass type (also called high wave pass): the light longer than the selected wavelength passes through, and the light shorter than the wavelength is cut off, such as infrared transmission filter.

ABOUT BORISUN

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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