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介绍了横向塞曼效应He-Ne激光器的磁场设定、信号获取、利用半导体制冷(TEC)的主从控制稳定频率的技术。阐述了由程控倍频模块和双通道缓冲连续计数模块组成的电子细分电路,实现可用按键设定2、4、8、16四种计数脉冲细分系数,以获取不同干涉测量分辨力。实验得出了横向塞曼稳频激光器的频率稳定度为1.74×10-9,稳频时激光管温度为43℃,克服了加热稳频法激光管温度过高、不易散热以及风扇风冷法激光频率短期稳定度低的缺点。系统具有0.16、0.08、0.04、0.02μm四种测量分辨力。
The magnetic field setting and signal acquisition of transverse Zeeman-effect He-Ne lasers are introduced. The technique of stabilizing the frequency of master-slave control using semiconductor cooling (TEC) is introduced. The electronic subdivision circuit composed of programmable frequency doubling module and double channel buffer continuous counting module is described. Four kinds of counting pulse subdivision coefficients of 2, 4, 8 and 16 can be set by keys to obtain different interference resolution. The experimental results show that the frequency stability of the transverse Zeeman frequency stabilization laser is 1.74 × 10-9 and the temperature of the laser tube is 43 ℃ when the frequency is stabilized. This overcomes the overheating of the laser tube by heating and frequency stabilization method, Short-term stability of laser frequency shortcomings. The system has 0.16, 0.08, 0.04, 0.02μm four kinds of measurement resolution.