四频差动激光陀螺中的粒子数脉动效应  

Population pulsation effect in four-frequency differential laser gyro

作　　者：杨建强[1] 王国臣[1] 

机构地区：[1]国防科技大学光电科学与工程学院,湖南长沙410073

出　　处：《应用光学》2009年第4期692-696,共5页Journal of Applied Optics

摘　　要：为研究激光陀螺精细模耦合作用,考虑了增益介质中的粒子数脉动效应。从激光器物理原理出发,分析了粒子数脉动效应的产生机制,结合四频差动激光陀螺特点,得出粒子数脉动效应是一种精细模耦合效应,不同激光模式间的拍频使增益介质中粒子数布居差产生调制,进而对模耦合产生影响。数值计算了粒子数脉动在耦合效应中的大小。计算结果表明:粒子数脉动效应和其他耦合效应随腔频变化基本一致,在大多数腔频范围内数值较小,为其他耦合效应的4%以下;在某些腔频范围(如0.37<ξ<0.46,0.02<ξ<0.06,0.86<ξ<0.88)有较大数值,为其他耦合效应的80%以上,在激光陀螺的模耦合分析中不可忽略。The population pulsation effect in the gain medium was considered to research the fine mode coupling effects in the laser gyro. Proceeding from the laser physics principle, the generation mechanism of population pulsation is analyzed. In association with the characteristics of four-frequency differential laser gyro, it is found that the population pulsation effect is one of the fine mode coupling effects. The level of the population pulsation effect in the coupling effects was calculated numerically. The result shows that the variation of the population pulsation effect with the cavity tuning is basically in accordance with other coupling effects, and it has small value in large cavity tuning ranges, which is less than 4% of other coupling effects; but it has relatively large value in some cavity tuning ranges （0. 37〈ε〈0.46, 0. 02〈ε〈0. 06, 0. 86〈ε〈0.88）, which is more than 80% of other coupling effects. Therefore, it can＇t be ignored in the mode coupling analysis of the laser gyro.

关 键 词：激光物理 粒子数脉动效应 四频差动激光陀螺 模耦合 

分 类 号：TN248.1[电子电信—物理电子学]