用于原子干涉测量的Raman光系统设计与实验
Design and Experiment of Raman Laser System for Atom Interferometric Measurement
查看参考文献17篇
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文摘
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研究了基于光学锁相环技术的Raman光系统,系统包含参考光、主激光和从激光三束激光,其中参考光采用调制转移光谱稳频后用做频率基准,主激光相对于参考光频差1 GHz实现相对于激发态远红失谐以避免激光与原子的直接作用,从激光相对于主激光频差6.8 GHz用于激发~(87)Rb原子基态超精细能级之间的跃迁,采用两套光学锁相环分别实现主、从激光的锁频锁相。测量结果表明,两套光学锁相环的相位噪声在100 Hz~1 MHz频段分别低于–70 dBc/Hz和–65 dBc/Hz,因此相位噪声对单次原子干涉重力测量的影响为5.3×10~(–7)。采用两台锥形放大器分别对主、从激光进行功率放大以保证主、从激光功率比严格为1∶2,采用光纤传输与空间光传输相结合的设计实现主、从激光的合束、偏振统一及频率调制,最终获得的Raman光总功率为180 mW。持续功率测量结果显示,在没有额外增加功率稳定元件的条件下Raman光的总功率最大起伏小于5%,满足原子干涉测量实验需求。 |
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其他语种文摘
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Based on optical phase-locked loop technology,a Raman laser system including three lasers, reference,master and slave lasers,is studied. Among which,the reference laser was firstly frequencylocked by modulated transfer spectrum technology and then as a standard frequency;the master laser, which has a frequency difference of 1 GHz relative to the reference laser,was red detuned from excited stated to prevent direct interaction between lasers and atoms;the salve laser,having a frequency difference of 6.8 GHz relative to the master laser,was used to excite the transmission between the hyperfine energy levels of ground state ~(87)Rb atoms. Respectively,the master and slave lasers were locked by two sets of optical phase-locked loop. The measurement results reveal that the phase noises of the two sets of optical phase-locked loop are within the range of 100 Hz to 1 MHz and lower than –70 dBc/Hz and –65 dBc/Hz respectively,and accordingly,the influence of phase noise on atom interferometric gravity measurement is as low as 5.3×10~(–7) per shot. The master and slave lasers are amplified by two separate taped-amplifiers to ensure that the master laser's power is half to that of the slave laser;the composition,polarization unification,and frequency modulation of both the master and slave lasers are realized by the combination laser transmission in fiber and free space. As a result,the Raman laser with a total power of 180 mW is realized,and the maximum fluctuation of total power less than 5% is achieved in long-term power measurement depended not on any additional power stabilizer,satisfying the experimental requirement of atom interferometry measurement. |
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来源
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光子学报
,2021,50(9):0914001 【核心库】
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DOI
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10.3788/gzxb20215009.0914001
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关键词
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原子干涉测量
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Raman激光脉冲
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受激Raman跃迁
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光学锁相环
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相位噪声
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地址
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1.
中国科学院西安光学精密机械研究所光学定向与瞄准技术研究室, 西安, 710119
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陕西师范大学物理学与信息技术学院, 西安, 710119
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1004-4213 |
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学科
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物理学;机械、仪表工业 |
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基金
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中国科学院“西部之光”西部青年学者项目
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陕西省重点研发计划
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西安光学精密机械研究所“一三五”重点培育项目
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文献收藏号
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CSCD:7068139
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