基于二次谐波特性的DFB激光器稳频新方法研究

窄线宽稳频激光器在工业生产控制中具有广泛的应用，但自由运转的半导体激光器的频率漂移限制了激光器的使用。为稳定半导体激光器的频率，提出了一种基于二次谐波吸收特性来实现窄线宽二极管激光器的稳频新方法，利用1.396 μm的DFB二极管激光器测量水汽的二次谐波信号来实现激光的稳频，实验结果表明在100 h内激光器输出波长漂移有效的抑制在±0.16 pm范围内，激光稳频后，其吸收峰的位置不随环境温度的变化而漂移。该方法具有简单、可靠等优点，对二极管激光频率的稳定具有广阔的应用前景。

A New Method of DFB Laser Frequency Stabilization Based on the Characteristics of the Second Harmonic

Frequency stabilized laser with narrow line width has an extensive application in the industrial production control. However, the Frequency variation of free working semiconductor laser limits the use of laser device. To stabilize the frequency of semiconductor laser, this paper presents a new way which is based on second harmonic absorption characteristics to achieve frequency stabilization of narrow line width diode laser. We have measured the second harmonic signal of water vapor with DFB diode laser of 1.396 μm, and the results show that laser output wavelength drift in 100 hours has been effectively controlled within ±0.16 pm. The absorption peak doesn’t vary with environmental temperature after frequency stabilization. This method is simpler and more reliable and has broad application prospects for frequency stabilization of diode laser.