Optical frequency synthesizer referenced to an ytterbium optical clock  

作　　者：YUAN YAO BO LI GUANG YANG XIAOTONG CHEN YAQIN HAO HONGFU YU YANYI JIANG LONGSHENG MA 

机构地区：[1]State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200062,China [2]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China

出　　处：《Photonics Research》2021年第2期98-105,共8页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(11927810,11822402,91636214,11654004,11804094);National Key Research and Development Program of China(2017YFA0304403)。

摘　　要：Optical clocks with an unprecedented accuracy of 10-18 promise innovations in precision spectroscopy and measurement. To harness the full power of optical clocks, we need optical frequency synthesizers(OFSs) to accurately convert the stabilities and accuracies of optical clocks to other desired frequencies. This work demonstrates such an OFS referenced to an ytterbium optical clock. The OFS is based on an optical frequency comb phase-locked to a commercial rubidium microwave clock;in this way most combs can operate robustly. Despite comb frequency instability at 10^(-11), the synthesis noise and uncertainty reach 6 × 10^(-18)(1 s) and 5 × 10^(-21), respectively, facilitating frequency synthesis of the best optical clocks. In the OFS, the coherence of the OFS internal oscillator at 1064 nm is accurately transferred to a 578 nm laser for resolving the hertz-level-linewidth ytterbium clock transition(unaffected by megahertz-linewidth comb lines) and faithfully referencing the OFS to an ytterbium optical clock.

关 键 词：SYNTHESIS DESIRED MICROWAVE 

分 类 号：TN752[电子电信—电路与系统] O441[理学—电磁学]