Generation of visible Raman operation laser by a fiber electro-optical modulator feedback loop  

作　　者：李睿睿 叶蔚然 陈一龙 陈树谦 亓文昊 崔金明 黄运锋 李传锋 郭光灿 Rui-Rui Li;Wei-Ran Ye;Yi-Long Chen;Shu-Qian Chen;Wen-Hao Qi;Jin-Ming Cui;Yun-Feng Huang;Chuan-Feng Li;Guang-Can Guo(CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China;Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China)

机构地区：[1]CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China [2]CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China [3]Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China

出　　处：《Chinese Optics Letters》2024年第2期180-185,共6页中国光学快报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2017YFA0304100);National Natural Science Foundation of China(Nos.11774335,11734015,and 12204455);the Key Research Program of Frontier Sciences,CAS(No.QYZDY-SSWSLH003);Innovation Program for Quantum Science and Technology(Nos.2021ZD0301604 and 2021ZD0301200)。

摘　　要：Phase-coherent multi-tone lasers play a critical role in atomic,molecular,and optical physics.Among them,the Raman opeartion laser for manipulating atomic hyperfine qubits requires gigahertz bandwidth and low phase noise to retain long-term coherence.Raman operation lasers generated by directly modulated and frequency-multipled infrared lasers are compact and stable but lack feedback control to actively suppress the phase noise,which limits their performance in practical applications.In this work,we employ a fiber electro-optical modulator driven by a voltage-controlled oscillator(VCO)to modulate a monochromatic laser and employ a second-harmonic generation process to convert it to the visible domain,where the beat note of the Raman operation laser is stabilized by controlling the output frequency of VCO with a digital phase-locked loop(PLL).The low-frequency phase noise is effectively suppressed compared to the scheme without active feedback and it reaches-80 d Bc/Hz@5 k Hz with a 20 k Hz loop bandwidth.Furthermore,this compact and robust scheme effectively reduces the system's complexity and cost,which is promising for extensive application in atomic,molecular,and optical physics.

关 键 词：phase-coherent laser quantum information trapped ion stimulated Raman transition phase-locked loop 

分 类 号：TN248[电子电信—物理电子学]