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Coherence length
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==Other light sources== Tolansky's ''An introduction to Interferometry'' has a chapter on sources which quotes a line width of around 0.052 angstroms for each of the Sodium D lines in an uncooled low-pressure sodium lamp, corresponding to a coherence length of around 67 mm for each line by itself.<ref>{{cite book |title=An Introduction to Interferometry |first=Samuel |last=Tolansky |isbn=9780582443334 |year=1973 |publisher=Longman}}</ref> Cooling the low pressure sodium discharge to [[liquid nitrogen]] temperatures increases the individual D line coherence length by a factor of 6. A very narrow-band interference filter would be required to isolate an individual D line.
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