Abstract
The inverted Lamb dip theory for a spatially-bounded plane laser beam is presented, valid for arbitrary gas pressure levels and field intensities. Line shape, power-broadening, contribution of transit-time and gas pressure effects to the dip linewidth have been computed and are found to be in perfect agreement with experimental data. In the limit of low pressure and intensity, the dip linewidth is found to depend only on the beam radius and the mean thermal velocity of molecules.
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