双纵模稳频氦氖激光器的光谱与频率复现性分析

Studies on the Spectrum and Frequency Repetition of Double-Mode He-Ne Laser with Frequency Stabilization

对双纵模稳频氦氖激光器的光谱及其频率复现性进行了理论估计, 进行了633 nm碘稳定氦氖激光器的拍频实验, 实验采用内腔激光器, 并采用双纵模稳频的方法, 通过观测激光器的两个偏振态互相垂直的相邻纵模的输出, 并使二者稳定到功率相等的参考点处, 获得激光稳定输出. 实验通过观察双纵模稳定激光的模式输出, 分析了影响激光频率复现性与频率稳定度的因素, 测量了稳定激光的功率和频率稳定度. 通过拍频测量, 对激光器的频率复现性进行了分析, 复现性用频差可以达到(1～2)×10-8量级. 通过实验表明, 双纵模稳频氦氖激光器的频率复现性完全符合用于长度精密测量的稳频激光器的要求, 激光器可以很稳定地工作, 稳定度用阿伦偏差表示可以达到10-10量级, 可以作为实用的稳频激光标准.

Theoretical analysis of spectrum and frequency repetition of the double-model frequency stabilization He-Ne laser has been done, and the beat frequency experiment using 632 nm I2 frequency stabilization He-Ne laser has been carried out. The authors used the intercavity laser, and the double mode frequency stabilization to get the laser stabilized output through adjusting the two neighbor vertically polarized modes to the equal power reference point. Through the experiment, the authors analyzed the factors which affect the laser frequency repetition and stabilization, and measured the stabilized laser power and the frequency stabilization. The beat frequency experiment has shown that the frequency repetition can reach （1-2）×10^-8 by frequency difference, and the laser stabilization can reach 10^-10 by Allan variances. The experiments show that the stabilized laser can work well and can be used as frequency reference point.