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介绍了两种用于实现中等输出激光功率且位相锁定的大频差激光系统的实验方案及典型结果.其中,基于分布反馈式(DFB)半导体激光器具有的较高的边模抑制比所导致的单模运转特性,文章采用光学注入锁定方法在实验中实现了两束波长为852nm、位相锁定且频差为9.2GHz(对应于铯原子基态超精细分裂)的中等输出激光功率(～150mW)双色激光.拍频测量结果表明二者的相对线宽约1Hz(受限于所用频谱分析仪的分辨带宽).此外,在充有20Torr缓冲气体氖并将剩磁屏蔽至约20nT的铯原子气室中,采用该激光系统,在实验中观察到了线宽约12.3kHz的相干布居俘获(CPT)信号.
Two experimental schemes and typical results of large-difference laser systems for achieving medium-power output laser power and phase locking are introduced, in which, based on the high side-mode rejection ratio of distributed feedback (DFB) semiconductor lasers, Single-mode operation characteristics of the optical injection locking method in the experiment achieved two beams of the wavelength of 852nm, the phase-locked and the frequency difference of 9.2GHz (corresponding to the superfine splitting of the cesium atomic state) moderate output laser power (~ 150mW) Laser beat measurement results show that the relative width of the two about 1Hz (limited by the resolution bandwidth of the spectrum analyzer used.) In addition, filled with 20Torr buffer gas neon and the residual magnetism to about 20nT cesium atomic gas chamber In this experiment, coherent population capture (CPT) signal of about 12.3 kHz in line width was observed in the experiment.