Stabilized solid-state gyrolaser

A solid-state gyrolaser comprising:

• at least one optical cavity in which two counter-propagating optical modes can propagate in opposite direction to one another, and
• a device for stabilizing intensities so as to maintain equilibrium of the two counter-propagating modes having at least, inside the optical cavity, an optical assembly comprising:
• a polarizing element,
• a non-reciprocal effect device acting on polarization states of the counter-propagating modes,
• a reciprocal effect device also acting on the polarization states of the counter-propagating modes,
• the device for stabilizing the intensities having:
• control means operable to establish a control command to control at least one effect of the said reciprocal effect device or non-reciprocal effect device,
• a means for calculating a rotation measurement of the gyrolaser on a basis of the counter-propagating modes having a frequency difference between them, the means for calculating a rotation measurement being operable to calculate a rotation measurement by assuming that the frequency difference between the two counter-propagating modes is induced only by rotation of the optical cavity, characterized in that it furthermore comprises:
• a means for measuring the control command,
• a means for storing a behaviour model of a frequency bias induced by the device for stabilizing the intensities, as a function of the control command,
• a means for calculating the frequency bias induced by the device for stabilizing the intensities, on the basis of a value of the control command and the model,
• a means for calculating a bias in the rotation measurement induced by the frequency bias, and
• a means for compensating for the bias in the rotation measurement.