Calculate coherence length from linewidth
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where Δν is the (full width at half-maximum) linewidth (optical bandwidth). This coherence length is the propagation length after which the magnitude of the coherence function has dropped to the value of 1 / e.
In the literature, one often finds the above equation without the factor π in the denominator – often just for estimating the order of magnitude of the coherence length, without referring to a precise definition of optical bandwidth (e.g., as full width at half-maximum) and coherence length.
Note that such relations are not valid in cases where the coherence function has a more complicated shape, as is the case for, e.g., a frequency comb.
In the literature, one often finds the above equation without the factor π in the denominator – often just for estimating the order of magnitude of the coherence length, without referring to a precise definition of optical bandwidth (e.g., as full width at half-maximum) and coherence length.
Note that such relations are not valid in cases where the coherence function has a more complicated shape, as is the case for, e.g., a frequency comb.
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