激光陀螺谐振腔横模特征的测量与分析

王朋国; 张自国; 叶萍

doi:doi:10.3788/gzxb20154404.0414003

光子学报, 2015, 44 (4): 0414003, 网络出版: 2015-04-28

激光陀螺谐振腔横模特征的测量与分析

Measurement and Analysis of Transverse Modes Characteristic of Laser Gyro Resonator

论文大纲

王朋国 ^*张自国叶萍

作者单位

中航工业西安飞行自动控制研究所, 西安 710065

摘要

为了判定被测激光的模式特征, 基于激光的频率特性, 提出了一种测量激光陀螺谐振腔横模特征的方法.利用F-P扫描干涉仪, 可以实时在线测量激光模式分布特性, 该方法以已知F-P扫描干涉仪的频率间隔和扫频速度为比例尺, 将难以测量的横模频率间隔转化为易于测量的时间间隔, 通过测量从扫描干涉仪给出的谱图, 计算出不同横模的频率间隔与纵模间隔的比例系数, 并与该陀螺的理论比例系数进行比较, 从而实现对激光陀螺谐振腔横模特征的精确判定.通过对某型环形激光谐振腔的测量实验, 得到了该陀螺模式特征随着工作电流大小变化的规律: 随着放电电流的增加, 激光陀螺腔内所振荡的横模由单一的基模逐渐转变为基模和高阶模的混合模,并准确地判定出该谐振腔横模特征, 其测量结果与理论结果误差小于2%.利用该方法横模频率间隔测量准确度可达1 MHz, 重复性可达0.4 MHz.

Abstract

Based on the frequency properties of laser, a novel method for measuring modes characteristic of laser gyro resonator is presented to confirm the mode characteristics of of measured laser. In which the characteristic distribution of laser modes are measured on-line by using a scanning interferometer with a con-focal resonator, take the known frequency spacing and swept rate of scanning interferometer as scale, it translates unfathomable frequency spacing into fathomable time spacing, and calculate the inverse proportion of different transverse mode frequency spacing and longitudinal mode frequency spacing. Besides it compares this value to the theoretic inverse proportion of the laser gyro, thereby the accurate mode characteristic of laser gyro resonator comes true. The experimental results of some laser gyro shows the relationship between the modes characteristic and its discharge current: the oscillating transverse mode in ring gyros cavity gradually changes from sigle fundamental mode to mixed mode with fundamental mode and high order mode. And the accurate mode characteristics is gained, the error between experimental results and theoretic value is less than 2%,The measurement accuracy and repetition of transverse mode frequency spacing and can be up to 1 MHz and 0.4 MHz respectively.

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王朋国, 张自国, 叶萍. 激光陀螺谐振腔横模特征的测量与分析[J]. 光子学报, 2015, 44(4): 0414003. WANG Peng-guo, ZHANG Zi-guo, YE Ping. Measurement and Analysis of Transverse Modes Characteristic of Laser Gyro Resonator[J]. ACTA PHOTONICA SINICA, 2015, 44(4): 0414003.

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