In this paper we propose an analytical approach of describing the tuning properties of the MG-Y laser by means of analytical description of the wavelength dependence of the three tuning currents. The model is based on the theoretical analysis and it was experimentally verified. The results of experiments are included in the second part of the paper. Finally, we conclude with the discussion on the model precision and applications.
It has become a standard to use Shupe's nonreciprocity formula for calculating the thermally induced bias error in fiber gyroscopes. This effect is initiated by thermal waves propagating through the material. However, it seems as if it has not been recognized yet that elastooptical interactions in the fiber can also lead to a nonreciprocity effect. In this case it is not required that a thermal wave propagate through the material, a simple temperature change -- even if homogeneous -- would have the same effect. In this contribution, we demonstrate the nature of the effect and, based upon the standard architecture of a sensor coil assembly, report on calculations (including FEM) elucidating the origination of elastic stress leading to a nonreciprocity.