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2.
Precise measurement of the line width of the photoassociation spectra of ultracold molecules by using a frequency shifter
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We propose a technique to precisely measure the line width of the photoassociation spectra of the excited cesium molecule by using a frequency shifter to generate two laser beams with a precise frequency difference. A series of photoassociation (PA) spectra are recorded with two laser beam induced molecular lines, whose peak separation serves as an accurate frequency ruler to measure the line width of the PA spectra. The full width half maximum line width was studied as a function of PA laser intensity. The extrapolated value at zero laser intensity is (34.84 ± 0.22) MHz. By analyzing other broadening mechanisms, a value of (32.02 ± 0.70) MHz was deduced. It is shown that this scheme is inexpensive, simple, robust, and is promising for applications in a variety of other atomic species. 相似文献
3.
Nanofibers have many promising applications because of their advantages of high power density and ultralow saturated light intensity. We present here a Zeeman shift of the Doppler-broadened cesium D2 transition using a tapered optical nanofiber in the presence of a magnetic field. When a weak magnetic field is parallel to the propagating light in the nanofiber, the Zeeman shift rates for different circularly polarized spectra are observed.For the +component, the typical linear Zeeman shift rates of = 3 and = 4 ground-state cesium atoms are measured to be 3.10(±0.19) MHz/G and 3.91(±0.16) MHz/G. For the -component, the values are measured to be-2.81(±0.25) MHz/G, and-0.78(±0.28) MHz/G. The Zeeman shift using the tapered nanofiber can help to develop magnetometers to measure the magnetic field at the narrow local region and the dispersive signal to lock laser frequency. 相似文献
4.
Systematically investigating the polarization gradient cooling in an optical molasses of ultracold cesium atoms
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We systematically investigate the polarization gradient cooling (PGC) process in an optical molasses of ultracold cesium atoms. The SR mode for changing the cooling laser, which means that the cooling laser frequency is stepped to the setting value while its intensity is ramped, is found to be the best for the PGC, compared with other modes studied. We verify that the heating effect of the cold atoms, which appears when the cooling laser intensity is lower than the saturation intensity, arises from insufficient polarization gradient cooling. Finally, an exponential decay function with a statistical explanation is introduced to explain the dependence of the cold atom temperature on the PGC interaction time. 相似文献
5.
发展了一种超高灵敏的CO痕量气体测量装置,该装置采用4.65μm脉冲式中红外外腔量子级联激光器作为激发光源,结合石英增强光声光谱技术,对2135~2225cm-1之间的CO基频振动光谱带R支进行连续光谱扫描。水被加入到被测气体中,以加快较慢的CO分子振动-平动弛豫率。在锁相放大器时间常数为3ms,激光器占空比和扫描速率为50%和18cm-1/s时,获得的最小探测极限为4.6×10-8(体积分数),与之对应的归一化噪声等效吸收系数为1.07×10-8 cm-1 W/Hz。 相似文献
6.
Reanalysis of the photoassociation spectrum of the weakly binding (6S1/2 + 6P3/2) lg 133Cs2 levels, reported in the previous study [J. Mol. Spectro. 255 (2009) 106], is performed by using a Lu-Fano graph coupled to the improved LeRoy- Bernstein formula including two additional modified terms. A more accurate coefficient (c3) is obtained for the leading long-range potential (-c3/R3) of a diatomic molecule. 相似文献
7.
钾原子中由四波,六波混频过程产生的相干辐射 总被引:1,自引:1,他引:1
当双光子共振激发钾原子于6S能级时,由光泵受激辐射,串级受激辐射参与的四波、六波混频以及电离复合的布居过程,产生了位于可见区的诸多相干辐射,文中对混频机制进行了分析和讨论,并对所测得的相干辐射进行了标识。 相似文献
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