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Spectral purity is a quantification of the monochromaticity of a given light sample. This is a particularly important parameter in areas like laser operation and time measurement. Spectral purity is given by:

$Spectral\;purity={\frac {\triangle v}{v}}$

Spectral purity is easier to achieve in devices that generate visible and ultraviolet light, since higher frequency light results in greater spectral purity.

In terms of RF communication, Spectral purity is the inherent stability of a signal, defined as How clean a spectrum is compared to what it should be.

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