光纤环形腔激光陀螺中的闭锁效应  

Lock-in Effect in Fiber Ring Laser Gyros

作　　者：苏觉[1] 钱景仁[1] 

机构地区：[1]中国科技大学电子工程与信息科学系光波实验室,安徽合肥230027

出　　处：《中国激光》2010年第10期2487-2490,共4页Chinese Journal of Lasers

摘　　要：通过理论分析,得到了掺铒光纤环形腔激光陀螺中存在后向反射时,陀螺的两束激光频差和陀螺转速动态关系的解析表达式,并用矢量图明确表明了闭锁效应出现的条件。分析表明光纤激光陀螺的闭锁主要是由瑞利后向散射引起的,这一散射虽然在红外波长甚弱,但在有源环形腔内会被显著加强,因此成为陀螺闭锁的主要原因。实验证实了上述理论分析结果,在陀螺旋转速度小于10°/s时出现了闭锁。Taking account of the backscattering in a ring cavity,resonance behavior of two counter-propagating lasing beams is analyzed and the dynamic lasing frequencies as a function of rotation rates are obtained in a close form.The condition for occurring lock-in effect in the gyro is also obtained easily from the vector diagrams.It is noted that the Rayleigh backscattering is the main source to form the lock-in effect,although the scattering is weak in a fiber at infrared wavelength,which can be considerably enhanced in an active resonator.The above mentioned analytic close form of dynamic frequencies is confirmed by a fiber ring laser gyro experiment,and the gyro is locked-in when its rotation rate is less than 10° /s.

关 键 词：激光器 掺铒光纤环形腔激光陀螺 闭锁效应 瑞利散射 

分 类 号：V241.558[航空宇航科学与技术—飞行器设计]