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本文基于新型单波长外腔共振和频技术实现了转换效率高、波长可调谐589nm激光的输出,其中基频光波长分别为1583nm和938nm,和频晶体为周期极化铌酸锂.在1583nm激光频率被锁定到外部环形腔腔模后,通过对938nm激光的频率扫描实现了输出功率4.96mW,调谐范围7GHz的589nm激光输出,并采用声光调制器的伺服反馈技术有效提高了输出功率的稳定性.最后采用该光源对钠原子在348—413K(75—140C)时D2线的饱和荧光谱进行了测量.观察到了多普勒背景下钠D2a,D2b以及Crossover的亚多普勒结构,其均可为589nm频率的锁定提供参考信号.
In this paper, based on the new single-wavelength external cavity resonance and frequency technology, a high-efficiency, tunable output wavelength of 589nm laser is achieved, in which the fundamental frequency of light is 1583nm and 938nm, respectively, and the frequency crystal is periodically poled lithium niobate. After the frequency is locked to the external circular cavity mode, the output power of 4.96mW and the tuning range of 7GHz 589nm laser output are achieved through the frequency sweep of the 938nm laser, and the servo feedback technology of the acousto-optic modulator is used to effectively improve the output power stability Finally, this light source was used to measure the saturation fluorescence spectrum of D2 line at 348-413K (75-140C) for sodium atom.The structure of sodium D2a, D2b and Crossover’s Doppler were observed in Doppler background, Can provide the reference signal for the locking of 589nm frequency.