Influence of longitudinal magnetic field on nonreciprocal effect in a ring laser

In order to analyze the nonreciprocal effect induced by longitudinal magnetic field in a ring laser,a mathematic model for the opposite waves in the ring laser was made based on Jones matrix.The ellipticity,azimuth and frequency difference of the opposite waves in case of slightly noncoplanar resonator were calculated.It is found that:the gain of the active medium subjected to a longitudinal magnetic field can influence the ellipticity and azimuth of the opposite waves;the magnetic sensitivity increases with the gain of the active medium and it is influenced by the detuning of the ring laser.The results obtained are helpful to reduce the magnetic sensitivity in a ring laser.