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激光波长在测量方面的广泛应用决定了激光器输出频率的重要程度。文中分析了各种影响 He-Ne激光光源频率稳定性的因素,如温度变化、机械振动以及磁场影响等。还介绍了目前常见的三种稳频技术:蓝姆凹陷稳频法、饱和吸收稳频法和塞曼效应稳频原理。并分析了这些技术各自的优缺点。着重介绍了热稳频法。较之前三种方法,热稳频法的系统结构简单、抗干扰能力强,因此得到了更广泛的应用。最后展望了稳频技术的新发展,即通过检测频率获得误差信号的拍频稳频技术。
The wide application of laser wavelength in measurement determines the importance of laser output frequency. In this paper, a variety of factors that affect the frequency stability of He-Ne laser light source are analyzed, such as temperature changes, mechanical vibration and magnetic field effects. Also introduced the current common three frequency stabilization techniques: Lamb depression frequency stabilization method, saturated frequency stabilization method and Zeeman effect frequency stabilization principle. And analyzed the respective advantages and disadvantages of these technologies. Focus on the thermal stabilization method. Compared with the previous three methods, the system of the thermal stabilization method has a simple structure and strong anti-interference ability, and thus has been widely used. Finally, the new development of frequency stabilization technology is forecasted, that is, the frequency-beat frequency stabilization technique of obtaining the error signal by detecting the frequency.