谐振式光波导陀螺激光双重锁频技术

A multilevel Laser Frequency Lock-in Technique Based on Resonator Integrated Optic Gyro

在陀螺应用中,当激光器调谐范围小于谐振腔的自由谱宽时,谐振频率漂移出激光器的调谐范围而导致陀螺失锁;而增大调谐系数时,会造成激光器控制精度的下降。因此提出了一种应用于集成化光波导陀螺样机的半导体激光器双重锁频的方法,解决了光波导谐振腔的失锁问题,并且在保证温度变化不失锁的前提下通过提升激光器控制精度,将锁频精度从7.22°/h提高到2.86°/h,完成了尺寸为Φ18 cm×20 cm的谐振式光波导陀螺的集成化,其1 h长期零偏稳定性为0.007 3°/s。

In the gyroscope application,losing lock and low lock-in accuracy are serious problems in digital RIOG at present.Therefore,a multilevel laser frequency lock-in technique is proposed.Experimental results show that this method can solve the problem of losing lock,and increase the lock-in accuracy more than 10 times in a variable temperature environment without out-of-lock.The integration of digital miniaturized RIOG prototype with size ofΦ18 cm×20 cm has been completed,a long-term(1 h)bias stability of 26.6°/h is successfully demonstrated.