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

Chinese Optics Letters 2024年第2期22卷 180-185页

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 CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Phase-coherent multi-tone lasers play a critical role in atomic,molecular,and optical *** them,the raman opeartion laser for manipulating atomic hyperfine qubits requires gigahertz bandwidth and low phase noise to retain long-term *** 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 *** 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 ***,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

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Theoretical Analyses and ExperimentalDemonstration of Coherent Splittingof Atomic Wave Packet

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Chinese Journal of Lasers 1997年第1期B6卷 29-38页

作者： XU Xinye ZHOU Shanyu HUO Yunzheng Li Fosheng WANG Yuzhu(Joint Laboratory for quantum Optics,Shanghai Institute of Optics and fine Mechanics,Chinese Academy of Sciences,Shanghai 201800) Shanghai Inst of Optics and Fine Mechanics Chinese Acad of Sciences Shanghai China

A new method of realizing coherent split of atomic wave packet has been presented in this paper. Due to using Doppler effect and stimulated raman transition, it Can be applied directly in thermal atomic beam and only needs a single-frequency standing wave laser field. Theoretical analyses show that of both atoms and light field meet some conditions, atomic wave packet will be split coherently after interaction. Finally,the experiment of the atomic beam splitter by using this method is described. The results are in good agreement with the theoretical predication.

关键词： stimulated raman transition coherent superpostion state coherent splitting of atomic wave packet atomic beam splitter

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