Ultra Narrowband Filter (FWHM < 5nm)

A narrow band filter is a type of optical filter that allows light signals to pass through in a specific band, while blocking or attenuating light signals that deviate from this band. A narrow band optical filter is a subcategory of bandpass filter, which is a filter that transmits light within a certain range of wavelengths and rejects light outside this range.

Ultra Narrowband Filter (FWHM < 5nm)

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Applications

A narrow band optical filter is useful when you need to isolate a very narrow region of the spectrum, such as a specific emission line or laser wavelength. A narrow band optical filter can also reduce the background noise and enhance the signal-to-noise ratio of the detected signal. Some applications that require narrow band filters are LIDAR, astronomy, fluorescence microscopy, spectroscopy, and laser-based systems .

Bandwidth

The bandwidth of a narrow band filter is measured at half-peak transmittance levels, which means the wavelengths where the transmittance is half of the maximum value. The bandwidth of a narrow band filter depends on the design and fabrication method of the filter, but it is typically less than 6% of the center wavelength value. For example, a narrow band filter with a center wavelength of 500 nm may have a bandwidth of 10 nm or less. Some ultra-narrow band filters can have bandwidths as small as 0.15 nm.

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