关于用光折变晶体提高光纤陀螺灵敏度的设想

光纤陀螺是一种新型的惯性器件.光纤陀螺的理论灵敏度是最高的.但目前光纤陀螺的实际灵敏度还远没有达到理论灵敏度的水平,其主要原因是:光纤中存在瑞利散射、双折射现象以及其它的非线性效应,如Kerr效应等引起光束非互易的相移.本文提出利用一种新型的非线性光学材料---光折变晶体的光折变效应来补偿上述非互易相差的设想:利用光折变晶体的热透镜效应来减弱或消除瑞利散射的影响;利用光折变晶体的二向相差效应来消除或修正双折射现象和克尔效应的影响,从而达到提高光纤陀螺的灵敏度的目的.

Improving the Sensitivity of Fiber-optic Gyroscope by Using Photorefractive Crystal

Fiber-optic gyroscope is a new kind of inertial device.It has the highest theoretic sensitivity.But at present,its actual sensitivity is far less than the theoretic sensitivity.The main cause is:there are Rayleigh scattering,birefringence phenomenon and other nonlinear effects,such as Kerr effect,in optical fibers.They will cause nonreciprocal phase shifts of beams.This paper proposes to compensate such nonreciprocal phase errors by using photorefractive crystal,a new kind of nonlinear optical material,that is,using its thermal lens effect to weaken or eliminate the influence of Rayleigh scattering,using its bilateral phase effect to eliminate or correct the influence of birefringence phenomenon and Kerr effect,and then to improve the sensitivity of fiber-optic gyroscope.