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- Interference_filter abstract "An interference filter or dichroic filter is an optical filter that reflects one or more spectral bands or lines and transmits others, while maintaining a nearly zero coefficient of absorption for all wavelengths of interest. An interference filter may be high-pass, low-pass, bandpass, or band-rejection. An interference filter consists of multiple thin layers of dielectric material having different refractive indices. There also may be metallic layers. In its broadest meaning, interference filters comprise also etalons that could be implemented as tunable interference filters. Interference filters are wavelength-selective by virtue of the interference effects that take place between the incident and reflected waves at the thin-film boundaries. The important characteristic of the filter is the form of the leaving signal. It is considered that the best form is a rectangle.Bandpass filters are normally designed for normal incidence. However, when the angle of incidence of the incoming light is increased from zero, the central wavelength of the filter decreases, resulting in partial tunability. The transmission band widens and the maximum transmission decreases. If λc is the central wavelength, λ0 is the central wavelength at normal incidence, and n* is the filter effective index of refraction, then: For example, for λ0=1550 nm, n*=1.5, Δλ = λ0−λc=32 nm, the rotation angle isθ = 17.7°. This corresponds to C-band or L-band in 1550 nm fiber-optic communications window. Equipped with a stepper motor and electronics, a tunable optical filter that tunes center transmission wavelength over C-band or L-band by remote control can be achieved. See diagram below for its working principle and tunable optical filter devices".
- Interference_filter thumbnail Tunable_Filter.gif?width=300.
- Interference_filter wikiPageID "41278".
- Interference_filter wikiPageRevisionID "600350657".
- Interference_filter hasPhotoCollection Interference_filter.
- Interference_filter subject Category:Interference.
- Interference_filter subject Category:Optical_filters.
- Interference_filter type Artifact100021939.
- Interference_filter type Device103183080.
- Interference_filter type Filter103339643.
- Interference_filter type Instrumentality103575240.
- Interference_filter type Object100002684.
- Interference_filter type OpticalFilters.
- Interference_filter type PhysicalEntity100001930.
- Interference_filter type Whole100003553.
- Interference_filter comment "An interference filter or dichroic filter is an optical filter that reflects one or more spectral bands or lines and transmits others, while maintaining a nearly zero coefficient of absorption for all wavelengths of interest. An interference filter may be high-pass, low-pass, bandpass, or band-rejection. An interference filter consists of multiple thin layers of dielectric material having different refractive indices. There also may be metallic layers.".
- Interference_filter label "Filtro interferenziale".
- Interference_filter label "Interference filter".
- Interference_filter label "Interferentiefilter".
- Interference_filter label "Interferenzfilter".
- Interference_filter label "مرشح التداخل".
- Interference_filter sameAs Interferenzfilter.
- Interference_filter sameAs Filtro_interferenziale.
- Interference_filter sameAs Interferentiefilter.
- Interference_filter sameAs m.0bb2m.
- Interference_filter sameAs Q904883.
- Interference_filter sameAs Q904883.
- Interference_filter sameAs Interference_filter.
- Interference_filter wasDerivedFrom Interference_filter?oldid=600350657.
- Interference_filter depiction Tunable_Filter.gif.
- Interference_filter isPrimaryTopicOf Interference_filter.
