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Spectral purity
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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/Frequency_drift/yY8tspSu">Frequency drift</a></li> <li><a href="/facts/Frequency_deviation/922FDF7s">Frequency deviation</a></li> <li><a href="/facts/Jitter/UpLIJDVQ">Jitter</a></li> <li><a href="/facts/Automatic_frequency_control/0jvfP9I5">Automatic frequency control</a></li> <li><a href="/facts/Allan_variance/WubU92LQ">Allan variance</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Rudolf Kingslake (2 December 2012). Applied Optics and Optical Engineering. Elsevier. pp. 30–. ISBN 978-0-323-14702-6. <a href="978-0-323-14702-6" target="_blank">978-0-323-14702-6</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>