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what is v stand for? Voltage?

In this case it's a nu, and it stands for frequency. DS ( talk) 20:19, 9 January 2010 (UTC) reply

"Spectral purity" is not at all a well-defined concept, and certainly not as defined here. ${\displaystyle {\frac {\triangle v}{v}}}$ is not 'particularly important', in fact it is close to meaningless. Physicists use linewidth ${\displaystyle \triangle v}$ instead, which is much more useful.

When use in the scientific literature, "spectral purity" usually refers to the ratio of amplified spontaneous emission and/or side modes to the main laser line. — Preceding unsigned comment added by 2001:630:12:10C0:9E8E:99FF:FEE3:4FDF ( talk) 16:39, 12 December 2014 (UTC) reply