The lock-in threshold of a single-mode 0.633-1' He-Ne laser was measured. Experiments were performed with a 1: 1 m~xture of the 2°N e and 22N e isotop~. Th~ l.ock-in threshold was found to increase with operation of the laser With smaller excess unsat~rated gam. MInImum lock-in threshold was found to occur at a higher frequency than th~ freq~ency at whl~h the output power was a maximum. A rotational mode competition between the oppositely dlrectec' travelmg waves was found for rotation rates less than the lock-in threshold. ~he bea~ t~avelin~ with a~d against the d~rection of rotation was found to decrease and increase, respectively, With mcreasmg rotatlOn rate. AnalYSIS showed that the single-mode-ring laser equations with mode coupling due to backscattering, satisfactorily explained the experiments' ,
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