Patent ID: 7561275
Filing Date: 2009-07-14
Classification: G01C

Abstract:
1. A laser gyro, comprising: a ring cavity of optical length L and of area A, and a solid-state amplifying medium wherein two optical waves of average wavelength λ propagate in opposite directions inside the cavity, the scale factor S of the laser gyro being equal to wherein the cavity has a geometric perimeter L o , said cavity comprising at least one optical element Oi traversed by the optical waves, i being an integer index varying between 1 and the total number of optical elements, the optical element Oi having length L i , optical index n i , x i being equal to the ratio being the coefficient of variation as a function of temperature T of the optical index n i of the optical element Oi, α i being the linear expansion coefficient of the optical element Oi, α 0 being the linear expansion coefficient of the constituent material of the cavity, v being the central emission frequency of the amplifying medium and being the coefficient of variation as a function of temperature T of said frequency, said optical elements and the amplifying medium are designed so that the following relation is substantially satisfied: