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The path length control mirror(PLCM)is essential for high precision ring laser gyro(RLG).In this paper the influence of the structural parameters of the PLCM on its length compensating efficiency(LCE)and the anti-transverse-deformation capability(ATDC)is numerically investigated,with the aid of the finite element software ANSYS.The result shows that the inner and outer diameters as well as the thickness of the deformation slot of the PLCM have significant influence on both its LCE and ATDC,while the position of the deformation slot of the PLCM have little impact on its LCE and mainly affect its ATDC.According to the simulation,two types of PLCM with the same parameters all but the position of deformation slot are fabricated and experimentally demonstrated,with the result showing great agreement with the simulation.That is to say,for a given overall dimension constraint,the dynamic stability of the RLG resonator can be dramatically enhanced by a proper design of the position of deformation slot of the PLCM,without almost any impact on its LCE.This will be of great value for the optimization of the PLCM for RLG,especially for miniature RLG.