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将激光频率锁定于合适的参考频率,可以有效地抑制激光器的频率起伏。本文采用铷原子D2线超精细跃迁线的饱和吸收光谱和偏振光谱分别获得鉴频曲线,通过电子伺服系统将频率校正信号负反馈到780 nm光栅外腔反馈半导体激光器外腔的压电陶瓷上的方法对激光器进行稳频。介绍了两种方法的基本原理和实验方案。与激光器自由运转300s时激光器典型的频率起伏约6.6 MHz相比,采用饱和吸收光谱和偏振光谱进行稳频,运转300 s时激光器典型的残余频率起伏分别约为1.5 MHz和0.6 MHz。分析表明,饱和吸收光谱稳频采用了相敏检波技术,需要对激光器进行频率调制,带来了额外的频率噪声,而偏振光谱稳频则是一种完全无频率调制的稳频方案。 相似文献
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铷原子双共振激发态光抽运光谱及其在1.5μm半导体激光器稳频中的应用 总被引:1,自引:1,他引:0
本文介绍分别采用双共振光抽运(DROP)和光学双共振(OODR)光谱技术获得铷原子激发态5P_3/2-4D_3/2 (4D_5/2)之间的超精细跃迁光谱.与传统的OODR光谱相比,DROP光谱在信噪比、线宽等方面具有明显的优势.当1 529 nm光栅外腔半导体激光器的频率采用DROP光谱锁定于~87Rb原子的5P_3/2(F'=3) -4D_3/2(F"=3)超精细跃迁线时,300 s内典型的残余频率起伏为~0.65 MHz;明显优于采用OODR光谱锁频的结果(300 s内典型的残余频率起伏为~1.8 MHz). 相似文献
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Autler-Townes doublet in the absorption spectra for the transition between excited states of cold cesium atoms 下载免费PDF全文
Autler-Townes splitting in absorption spectra of the excited states 6 2 P 3/2-8 2 S 1/2 of cold cesium atoms confined in a magneto-optical trap has been observed.Experimental data of the Autler-Townes splitting fit well to the dressed-atom theory,by which the fact of the cold atoms dressed by cooling/trapping laser beams is revealed.The results of the theoretical fitting with experiment not only told us the effective Rabi frequency cold atoms experienced,but also could be used for measuring the probability amplitudes of the dressed states. 相似文献
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Off-resonant double-resonance optical-pumping spectra and their application in a multiphoton cesium magneto-optical trap 下载免费PDF全文
We present an investigation of double-resonance optical pumping(DROP) spectra under the condition of singlephoton frequency detuning based on a cesium 6S1/2–6P3/2–8S1/2ladder-type system with a room-temperature vapor cell.Two DROP peaks are found, and their origins are explored. One peak has a narrow linewidth due to the atomic coherence for a counterpropagating configuration; the other peak has a broad linewidth, owing to the spontaneous decay for a copropagating configuration. This kind of off-resonant DROP spectrum can be used to control and offset-lock a laser frequency to a transition between excited states. We apply this technique to a multiphoton cesium magneto-optical trap, which can efficiently trap atoms on both red and blue sides of the two-photon resonance. 相似文献
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Extending a release-and-recapture scheme to single atom optical tweezer for effective temperature evaluation 下载免费PDF全文
By recording the fluorescence fraction of the cold atoms remaining in the magneto-optical trap (MOT) as a function of the release time,the release-and-recapture (R&R) method is utilized to evaluate the effective temperature of the cold atomic ensemble.We prepare a single atom in a large-magnetic-gradient MOT and then transfer the trapped single atom into a 1064-nm microscopic optical tweezer.The energy of the single atom trapped in the tweezer is further reduced by polarization gradient cooling (PGC) and the effective temperature is evaluated by extending the R&R technique to a single atom tweezer.The typical effective temperature of a single atom in the tweezer is improved from about 105 μK to about 17 μK by applying the optimum PGC phase. 相似文献
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Single atoms transferring between a magneto-optical trap and a far-off-resonance optical dipole trap 下载免费PDF全文
Based on our work on single cesium atoms trapped in a
large-magnetic-gradient vapour-cell magneto-optical trap (MOT), the
signal-to-noise ratio (SNR) is remarkably improved. Also a
far-off-resonance optical dipole trap (FORT) formed by a
strongly-focused 1064~nm single frequency Nd:YVO4 laser beam is
introduced. One cesium atom is prepared in the MOT, and then it can
transfer successfully between the MOT and the FORT which is
overlapped with the MOT. Utilizing the effective transfer, the
lifetime of single atoms trapped in the FORT is measured to be
6.9± 0.3~s. Thus we provide a system where the atomic qubit can
be coherently manipulated. 相似文献
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