激光陀螺光强扫模曲线是陀螺稳频的依据，也是激光陀螺环形激光器振荡特性的基本表征，同时也是陀螺性能好坏的重要标志之一。通过引入新的参量——模高，描述光强扫模曲线的其他特征。光强扫模曲线模高是在腔长变化一个0.6328 μm条件下对应光强的最大变化量，是反映光强扫模曲线尖锐度的特征量，该特征量与陀螺稳频精度、稳频响应时间等物理量直接相关，模高越大，则对应的稳频精度就越高，稳频响应时间越短。通过对激光陀螺扫模过程中模高产生的物理机理进行理论分析，确定出了影响模高的主要因素。通过理论分析、数值仿真得出：采取增大球面镜曲率半径、增大腔长、降低损耗、增大增益等措施，可使激光陀螺光强扫模曲线的模高增大3倍以上，这对于提升稳频精度、缩短稳频响应时间、降低陀螺比例因子非线性度误差、提高激光陀螺快速稳定性等具有重要的指导意义和工程实用价值。
Abstract
The ring laser gyro (RLG) light intensity mode-scanning curve is the basis of the frequency stabilization, and also is the basic characterization of the oscillation characteristics for RLG ring laser and is one of the important signs of the gyro performance. By introducing a new parameter which called mode height, other characteristics of the light intensity mode-scanning curve were described. The mode height of the light intensity mode-scanning curve was the maximum variation of the corresponded light intensity under conditions of one 0.632 8 μm cavity length change, which was a characteristic quantity reflecting the sharpness of the light intensity mode-scanning curve. This characteristic quantity was directly related to the gyro frequency stabilization accuracy and the frequency stabilization response time. The higher the mode height, the higher the corresponding frequency stabilization accuracy, and the shorter the frequency stabilization response time. The physical mechanism of the mode height in RLG scanning process was analyzed theoretically, and the main factors affecting the mode height were determined. Through the theoretical analysis and the numerical simulation, it is concluded that: by increasing the curvature radius of spherical mirror, increasing the cavity length, reducing the loss and increasing the gain, the mode height of the RLG light intensity mode-scanning curve can be increased more than 3 times, which has important guiding significance and practical engineering value for improving the frequency stabilization accuracy, shortening the frequency stabilization response time, reducing the nonlinear error of gyro proportional factor, and improving the fast stability of RLG.
关键词
模高 /
稳频精度 /
光强扫模曲线 /
激光陀螺
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Key words
ring laser gyro /
mode height /
light intensity mode-scanning curve /
frequency stabilization accuracy
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