Notchfilters Oct 30, 2009

Notchfilters produced by mso jena reject a specific narrow wavelength range, while providing high transmittance for the remaining part of the spectrum. Typically, a blocking of OD 5 is achieved in the stopband and T > 90% in the passband between 350 and 800 nm. The spectral distance between passband and blockband is below 2% of the blocked wavelength.

An increasing demand for notchfilters arises from biomedical applications. In typical set-ups for fluorescence analysis, notchfilters separate the exciting light from the fluorescence light emitted by the sample. Specific notch filters have the capability to reject several laser wavelengths. Notch filters in medical instruments block the high light intensity of a laser source while retaining a colour-accurate view for the operator.

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