INTERFERENCE FILTER TERMINOLOGY

Bandpass: The wavelength range (or band) where transmission is allowed to be passed by a wavelength selective optical component. Transmission above or below the wavelength is restricted through absorption and/or reflection.

Interference Filter: An interference filter used to isolate and transmit a narrow wavelength that is required and block all other wavelengths.

Blocking: The undesired filter transmittance outside the bandpass region.

Full-width Half-Maximum (FWHM): The bandwidth as measured at half-power points.

Centre Wavelength (CWL): The wavelength at the midpoint of the half power bandwidth (FWHM).

Filter Cavity: An optical "sandwich" of two partially reflective substrate layers separated by an evaporated coating which forms the dielectric spacer layer. Interference filters can be constructed with one or several cavities arranged in series.

Peak Transmission: The maximum transmission percentage in the passband

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