How Does Temporal Coherence Relate to Spectral Width in Absorption Features?

[Thomas Smid]

To spin my last post a bit further:

It appears that one could say then that the temporal coherence of a
given frequency spectrum can not be less than the coherence time
associated with the spectral width of any absorption features in the
spectrum.

Thomas

 

[Ericzz]

temperature coherence or longitudinal coherence

assume the wave length has a uniform distribution from lamda to lamda+deltalamda

then after N period, N.*lamda=(N+1)*(lamda+deltalamda), N can be found, and N.*lamda is about the longitudinal coherence or temperal coherence.
As I read elsewhere, this concept is essentially a statistical consequence...

To spin my last post a bit further:

It appears that one could say then that the temporal coherence of a
given frequency spectrum can not be less than the coherence time
associated with the spectral width of any absorption features in the
spectrum.

Thomas