中国激光, 2010, 37 (10): 2487, 网络出版: 2010-09-25
光纤环形腔激光陀螺中的闭锁效应
Lock-in Effect in Fiber Ring Laser Gyros
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。
Abstract
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.
苏觉, 钱景仁. 光纤环形腔激光陀螺中的闭锁效应[J]. 中国激光, 2010, 37(10): 2487. Su Jue, Qian Jingren. Lock-in Effect in Fiber Ring Laser Gyros[J]. Chinese Journal of Lasers, 2010, 37(10): 2487.