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Appl Opt. 2010 Sep 1;49(25):4801-7. doi: 10.1364/AO.49.004801.

Simple approach to the relation between laser frequency noise and laser line shape.

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  • 1Laboratoire Temps-Fréquence, Université de Neuchâtel, Avenue de Bellevaux 51, CH-2009 Neuchâtel, Switzerland.


Frequency fluctuations of lasers cause a broadening of their line shapes. Although the relation between the frequency noise spectrum and the laser line shape has been studied extensively, no simple expression exists to evaluate the laser linewidth for frequency noise spectra that does not follow a power law. We present a simple approach to this relation with an approximate formula for evaluation of the laser linewidth that can be applied to arbitrary noise spectral densities.

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