The ultrahigh resolution and sensitivity by spectral measurement on the basis of the ring laser

Experimental researches were carried out on four prismatic ring laser. Spectral measurements on contradirectional modes. Feature of the given method is that the change of absorption, a refraction index and nonreciprocal properties of optical medium is shown as in change of a ratio between contradirectional intensity modes and in change of a dispersive curve which is connected to the properties of the active medium.