Some features of the kinetics of the emission spectrum of a laser with a moving ruby rod

An experimental investigation was made of the influence of the motion of a ruby laser rod, relative to standing waves in the resonator, on the kinetics of the emission spectrum. Two main types of change in the emission spectrum resulted from the motion of the ruby rod: In one case the emission frequency periodically increased and in the other it periodically decreased. A possible mechanism of these effects was considered. A kinematic modulation of the intensities of the individual modes, which appeared because of the scattering of light on inhomogeneities in the ruby rod, was also observed.