Abstract
The longitudinally multimode class-$B$ laser with inhomogeneous broadening is known to behave as a chain of coupled oscillators, each being associated with one mode. If emission occurs along the two eigenstates of polarization, we show theoretically and experimentally that the waves propagating in the spectrum are characterized by two dispersion curves associated with oscillations in phase and in opposite phase of two close modes with different polarizations. These curves may be viewed as the analogs of the ``acoustical'' and ``optical'' branches in one-dimensional diatomic crystals.
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