Laser dynamics effects on the systematics of large size laser gyroscopes

We present the results of the experimental investigation of ring lasers dynamics obtained by operating the G-Pisa gyroscope with the laser plane oriented almost perpendicularly to the local North direction. In this configuration, the Earth's rotation contribution to the Sagnac frequency is less sensitive to orientation errors, and more precise observations of the laser dynamical parameters can be achieved. Cavity losses and scattering parameters are monitored by observing the single beams intensity modulation at the Sagnac frequency while the active medium parameters are identified by a dedicated spectroscopic analysis of the plasma dispersion function. A summary of the performances of both the identification and the frequency denoising algorithm.