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介绍了3种不同类型的高稳定度窄线宽激光器的研究进展。基于Littman结构和饱和吸收光谱稳频技术,研制了稳频外腔半导体激光器系统,输出波长为780.2nm,频率稳定度1MHz,不失锁时间大于12h。利用边带稳频技术将分布反馈(DFB)激光器的输出波长稳定在Cs原子的吸收谱线的边带处,引入数字信号处理器(DSP)全数字稳频控制技术,实现了自动找频和稳频,获得波长为852.3nm的稳频激光输出,24h内频率漂移为±2MHz。利用国产磷酸盐玻璃光纤作为增益介质,实现了一台高功率单纵模光纤激光器,制作的厘米级激光器实现了最大输出功率100mW,利用外部光反馈实现单偏振运转,测得输出线宽为2kHz,偏振消光比优于35dB。
The research progress of three different types of high stability narrow linewidth lasers is introduced. Based on the Littman structure and the saturation absorption spectrum stabilization technique, a frequency-stabilized external cavity semiconductor laser system is developed. The output wavelength is 780.2nm, the frequency stability is 1MHz, and the lockup time is longer than 12h. By using the sideband frequency stabilization technique, the output wavelength of distributed feedback (DFB) laser is stabilized at the sideband of the absorption line of Cs atom, and digital signal processor (DSP) full digital frequency stabilization control technology is introduced to realize the automatic frequency-finding and Stabilized to obtain a steady-state laser output wavelength of 852.3nm, 24h within the frequency drift ± 2MHz. Using domestic phosphate glass fiber as the gain medium, a single-mode fiber laser with high power is realized. The centimeter-level laser produced has a maximum output power of 100mW. Single-polarization operation is achieved by external optical feedback. The output linewidth is 2kHz , Polarization extinction ratio better than 35dB.