积分球冷原子钟探测光功率自动稳定实验研究
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摘要
建立了微瓦量级的激光功率自动稳定实验装置,通过自动反馈控制声光调制器的衍射效率,实现了激光功率的自动稳定。激光功率稳定后,激光相对强度噪声得到有效抑制,接近散弹噪声极限,激光功率的长期稳定度优于2×10-5(1000s)。推导了功率自动稳定系统的环路方程,分析了激光功率稳定环路对相对强度噪声的抑制作用。稳定后的激光应用于积分球冷原子钟的钟跃迁探测,对原子钟稳定度的影响小于1×10~(-13)τ-~(1/2),积分球原子钟的频率稳定度优于5×10~(-13)τ~(-1/2)(τ为取样时间)。
A laser power stabilization system for theμW probe laser is developed.Power stabilization is realized by automatically adjusting diffraction efficiency of the acousto-optic modulator.The relative intensity noise of the probe laser is effectively suppressed to the shot noise limit,and the long-term stability is better than 2×10-5(1000s).The loop function equation of the power stabilization system is deduced,and the suppression effect of the loop on the relative intensity noise is analyzed.The stabilized laser is applied to detecting the clock transition of the integrating sphere cold atom clock,and its contribution to the frequency stability is less than 1×10~(-13)τ~(-1/2)(τis the samping time).The frequency stability of the clock is improved to better than 5×10~(-13)τ~(-1/2).
A laser power stabilization system for theμW probe laser is developed.Power stabilization is realized by automatically adjusting diffraction efficiency of the acousto-optic modulator.The relative intensity noise of the probe laser is effectively suppressed to the shot noise limit,and the long-term stability is better than 2×10-5(1000s).The loop function equation of the power stabilization system is deduced,and the suppression effect of the loop on the relative intensity noise is analyzed.The stabilized laser is applied to detecting the clock transition of the integrating sphere cold atom clock,and its contribution to the frequency stability is less than 1×10~(-13)τ~(-1/2)(τis the samping time).The frequency stability of the clock is improved to better than 5×10~(-13)τ~(-1/2).
引文
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9 Micalizio S,Godone A,Calosso C,et al.Pulsed optically pumped rubidium clock with high frequency-stability performance[J].IEEE Transactions on Ultrasonics Ferroelectric Frequency Control,2012,59(3):457-462.
10 Liu P,Meng Y L,Wan J Y,et al.Scheme for a compact cold-atom clock based on diffuse laser cooling in a cylindrical cavity[J].Physical Review A,2015,92(6):062101.
2 Deng J L,Hu Z F,Li L,et al.Research on characteristics of pulsed optically pumped rubidium frequency standard[C].Proceedings of 7th Symposium on Frequency Standards and Metrology,Pacific Grove,2008:348-352.
3 Ivanov E N.Wide-band suppression of laser intensity noise[J].IEEE Transactions on Ultrasonics Ferroelectric Frequency Control,2009,56(1):22-26.
4 Seifert F,Kwee P,Heurs M,et al.Laser power stabilization for second-generation gravitational wave detectors[J].Optics Letters,2006,31(13):2000-2002.
5 Meng Yanling,Zheng Benchang,Liu Peng,et al.Experiment studies on the diffuse light cooling by using silver plated microwave cavity[J].Chinese J Lasers,2014,41(9):0918001.孟艳玲,郑本昌,刘鹏,等.积分球与微波腔一体化装置的研制[J].中国激光,2014,41(9):0918001.
6 Meng Yanling,Zheng Benchang,Liu Peng,et al.Experiment studies on the diffuse light cooling by using silver plated microwave cavity[J].Acta Optica Sinica,2014,34(9):0902001.孟艳玲,郑本昌,刘鹏,等.微波腔镀银实现漫反射冷却的实验研究[J].光学学报,2014,34(9):0902001.
7 Kwee P,Willke B,Danzmann K.New concepts and results in laser power stabilization[J].Applied Physics B,2011,102(3):515-522.
8 Kwee P,Willke B,Danzmann K.Shot-noise limited laser power stabilization with a high-power photodiode array[J].Optics Letters,2009,34(19):2912-2914.
9 Micalizio S,Godone A,Calosso C,et al.Pulsed optically pumped rubidium clock with high frequency-stability performance[J].IEEE Transactions on Ultrasonics Ferroelectric Frequency Control,2012,59(3):457-462.
10 Liu P,Meng Y L,Wan J Y,et al.Scheme for a compact cold-atom clock based on diffuse laser cooling in a cylindrical cavity[J].Physical Review A,2015,92(6):062101.