Electro-optic frequency combs generated via direct digital synthesis applied to sub-Doppler spectroscopy
Electro-optic frequency combs generated via direct digital synthesis applied to sub-Doppler spectroscopy
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DOI：
10.1364/osac.2.003576
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发表时间：
2019-12-15
期刊：
影响因子：
1.6
通讯作者：
Reschovsky, Benjamin J.
中科院分区：
文献类型：
--
作者：
Long, David A.;Reschovsky, Benjamin J.
采用直接数字频率合成和电光相位调制器相结合的方法，产生了齿距低至100赫兹的光学频率梳。这些梳子被用来探测钾蒸气细胞中的电磁诱导透明(EIT)和超精细泵浦。演示了长期相干平均，其性能与昂贵得多的任意波形产生器所达到的性能相似。从钾的EIT跃迁，我们能够确定基态的超精细分裂，合适的不确定度为80赫兹。重要的是，由于来自单一激光的控制光束和探测光束之间的相互相干，可以以多路复用的方式观察到线宽比激光线宽窄几个数量级的特征。这种方法消除了对传统连续激光或基于锁模激光的光学频率梳的缓慢扫描的需要。(C)OSA开放获取出版协议条款下的2019年美国光学学会
Direct digital synthesis in concert with an electro-optic phase modulator was employed to generate optical frequency combs with tooth spacings as low as 100 Hz. These combs were utilized to probe electromagnetically induced transparency (EIT) and hyperfine pumping in potassium vapor cells. Long-term coherent averaging was demonstrated with performance similar to that achieved with a vastly more expensive arbitrary waveform generator. From the potassium EIT transition we were able to determine the ground state hyperfine splitting with a fit uncertainty of 80 Hz. Importantly, because of the mutual coherence between the control and probe beams, which originate from a single laser, features with linewidths several orders-of-magnitude narrower than the laser linewidth could be observed in a multiplexed fashion. This approach removes the need for slow scanning of a traditional cw laser or mode-locked-laser-based optical frequency comb. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement